diff --git a/datasets/assetData/curves/aerostrip-phoenix.json b/datasets/assetData/curves/aerostrip-phoenix.json
index 3b1855d..64385eb 100644
--- a/datasets/assetData/curves/aerostrip-phoenix.json
+++ b/datasets/assetData/curves/aerostrip-phoenix.json
@@ -4,6 +4,8 @@
         "type": "Strip",
         "model": "AEROSTRIP",
         "membrane": "PHOENIX",
+        "membraneArea_m2_per_element": 1.0,
+        "membraneArea_m2_per_element_note": "Aerostrip strips are sized continuously rather than as discrete fixed-area elements. Setting per-element area to 1.0 m² is a normalisation choice: configure the diffuser node with `elements` equal to the total installed strip membrane area in m².",
         "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
         "coverageBasis": "bottom-coverage-pct",
         "coverageReference": [5, 10, 15, 20],
@@ -12,10 +14,10 @@
         "yAxisBasis": "ssotr-g-per-Nm3-per-m",
         "waterDepth_m": 4.75,
         "sources": [
-            "Floris de Winter (Entec Holland) email to R. de Ren on 2023-11-22 — tabulated SOTE [%] at 4.75 m water depth for bottom coverage 5/10/15/20 % at fluxes 10/25/40/55/70 Nm3/(h*m2 membrane). Original chart in 'SSOTE_4.75m different density.pdf'.",
+            "Floris de Winter (Entec Holland) email to R. de Ren on 2023-11-22 — tabulated SOTE [%] at 4.75 m water depth for bottom coverage 5/10/15/20 % at fluxes 10/25/40/55/70 Nm³/(h*m² membrane). Original chart in 'SSOTE_4.75m different density.pdf'.",
             "'SSOTR_dP.pdf' — AEROSTRIP fine-bubble diffuser SSOTR + Druckverlust (DWP) chart at water depth 4.05 m, blow-in depth 4.00 m, 21 % bottom coverage. Used for the DWP curve only (read off the vector chart)."
         ],
-        "note": "X-axis is flux per m² of membrane area, NOT per element. The existing diffuser specificClass passes `flow_per_element` to the interpolator — if you wire an AEROSTRIP model in, you must either set elements/area such that flow_per_element == flux_per_m2_membrane, OR extend _calcOtrPressure to apply the membrane-area conversion. SSOTR values are SOTE [%] / water_depth_m * 0.299 kg-O2/Nm3 * 10 (linear depth scaling). DWP curve was measured at 21 % bottom coverage; pressure loss is intrinsic to the diffuser geometry so the curve is shared across coverage values."
+        "note": "SSOTR values are SOTE [%] / water_depth_m × 0.299 kg-O₂/Nm³ × 10 (linear depth scaling). DWP curve was measured at 21 % bottom coverage; pressure loss is intrinsic to the diffuser geometry so the curve is shared across coverage values (single 'p_curve' entry under key '0')."
     },
     "sote_curve": {
         "5":  { "x": [10, 25, 40, 55, 70], "y": [34.20, 28.75, 26.16, 24.89, 24.19] },
@@ -36,7 +38,7 @@
         "20": { "x": [10, 25, 40, 55, 70], "y": [27.57, 23.18, 21.10, 20.06, 19.49] }
     },
     "p_curve": {
-        "21": {
+        "0": {
             "x": [5, 10, 25, 40, 55, 70, 80],
             "y": [46.0, 47.3, 51.1, 54.9, 58.7, 62.4, 65.0]
         }
diff --git a/datasets/assetData/curves/gva-elastox-r.json b/datasets/assetData/curves/gva-elastox-r.json
index aef1f8d..26314d6 100644
--- a/datasets/assetData/curves/gva-elastox-r.json
+++ b/datasets/assetData/curves/gva-elastox-r.json
@@ -3,24 +3,26 @@
         "supplier": "GVA",
         "type": "Tube",
         "model": "ELASTOX-R",
-        "stdAir": { "temp_C": 20, "pressure_bar": 1.01325, "RH_pct": 0 },
+        "membraneArea_m2_per_element": 0.18,
+        "membraneArea_m2_per_element_source": "placeholder — mirror of Jäger JetFlex TD-65-2-G EPDM 1000 mm (0.18 m²) until a real GVA ELASTOX-R sheet is supplied. Change here when the real value is known; specificClass reads it from this _meta field.",
+        "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
         "coverageBasis": "bottom-coverage-pct",
         "coverageReference": null,
         "dataQuality": "point",
-        "xAxisBasis": "per-element-Nm3h",
+        "xAxisBasis": "per-m2-membrane-Nm3h",
         "yAxisBasis": "ssotr-g-per-Nm3-per-m",
         "waterDepth_m": null,
-        "note": "Migrated 2026-05-12 from nodes/diffuser/src/specificClass.js _loadSpecs(). The legacy hardcoded data was tagged '2.4 elements/m²' by a prior agent; the originating vendor data was always intended as % surface-area coverage but the original test-bench coverage was not preserved when the numbers were inlined. Treat as a single-coverage point estimate (key '0' = unspecified). Do not extrapolate across density. SSOTR in g O2 / (Nm3 air * m of submergence)."
+        "note": "Migrated 2026-05-12 from nodes/diffuser/src/specificClass.js _loadSpecs(); the legacy '2.4 elements/m²' tag was a prior mis-conversion of the % bottom-coverage convention. Single-coverage point estimate (key '0' = unspecified). Native data was per-element Nm³/h; converted to per-m²-membrane Nm³/(h·m²) by dividing by the placeholder 0.18 m² element area — those numbers will shift the moment we get a real GVA sheet."
     },
     "otr_curve": {
         "0": {
-            "x": [2, 3, 4, 5, 6, 7, 8, 9, 10],
+            "x": [11.11, 16.67, 22.22, 27.78, 33.33, 38.89, 44.44, 50.00, 55.56],
             "y": [26, 25, 24, 23.5, 23, 22.75, 22.5, 22.25, 22]
         }
     },
     "p_curve": {
         "0": {
-            "x": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
+            "x": [11.11, 16.67, 22.22, 27.78, 33.33, 38.89, 44.44, 50.00, 55.56, 61.11, 66.67],
             "y": [40, 42.5, 45, 47.5, 50, 51.5, 53, 54.5, 56, 57.5, 59]
         }
     }
diff --git a/datasets/assetData/curves/jaeger-jetflex-td-65-2-g-epdm-1000.json b/datasets/assetData/curves/jaeger-jetflex-td-65-2-g-epdm-1000.json
index 6e736f9..ecd71b3 100644
--- a/datasets/assetData/curves/jaeger-jetflex-td-65-2-g-epdm-1000.json
+++ b/datasets/assetData/curves/jaeger-jetflex-td-65-2-g-epdm-1000.json
@@ -6,38 +6,38 @@
         "membrane": "EPDM",
         "tubeLength_mm": 1000,
         "totalLength_mm": 1062.5,
-        "perforatedArea_m2": 0.18,
         "outerDiameter_mm": 65,
+        "membraneArea_m2_per_element": 0.18,
         "operating": {
-            "continuousFlow_Nm3h": [2, 12],
-            "maxOverloadFlow_Nm3h": 20,
+            "continuousFlow_Nm3h_per_element": [2, 12],
+            "maxOverloadFlow_Nm3h_per_element": 20,
             "operatingMode": "continuous-or-intermittent"
         },
         "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
         "coverageBasis": "bottom-coverage-pct",
         "coverageReference": null,
         "dataQuality": "point",
-        "xAxisBasis": "per-element-Nm3h",
+        "xAxisBasis": "per-m2-membrane-Nm3h",
         "yAxisBasis": "ssotr-g-per-Nm3-per-m",
         "waterDepth_m": null,
         "source": "Jäger Umwelt-Technik 'JETFLEX TD 65-2 G Tube Diffuser' data sheet — vector chart on page 2 ('SSOTE and headloss for EPDM 1000 mm'). Curve coordinates recovered directly from the PDF vector paths on 2026-05-12 (bezier endpoints of the red SSOTE polyline and blue DWP polyline); axis calibration against the gridlines is exact.",
-        "note": "Vendor sheet states neither the tank-floor coverage nor the water depth at which the SSOTE curve was measured. Treat as a single-coverage point estimate (key '0' = unspecified); do not extrapolate across density. SSOTR = SSOTE * 0.299 kg-O2/Nm3 (DIN-1343 dry air, 0 °C 1013.25 mbar)."
+        "note": "Vendor sheet states neither tank-floor coverage nor water depth at which the SSOTE curve was measured — single-coverage point estimate (key '0' = unspecified), do not extrapolate across density. Native x-axis in the sheet is Nm³/h per tube; converted to canonical Nm³/(h·m² membrane) by dividing by perforated area 0.18 m²."
     },
     "ssote_curve": {
         "0": {
-            "x": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
+            "x": [11.11, 16.67, 22.22, 27.78, 33.33, 38.89, 44.44, 50.00, 55.56, 61.11, 66.67],
             "y": [8.20, 7.85, 7.57, 7.30, 7.10, 6.97, 6.85, 6.72, 6.60, 6.50, 6.40]
         }
     },
     "otr_curve": {
         "0": {
-            "x": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
+            "x": [11.11, 16.67, 22.22, 27.78, 33.33, 38.89, 44.44, 50.00, 55.56, 61.11, 66.67],
             "y": [24.52, 23.47, 22.63, 21.83, 21.23, 20.84, 20.48, 20.09, 19.73, 19.44, 19.14]
         }
     },
     "p_curve": {
         "0": {
-            "x": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
+            "x": [11.11, 16.67, 22.22, 27.78, 33.33, 38.89, 44.44, 50.00, 55.56, 61.11, 66.67],
             "y": [25.0, 27.5, 30.0, 32.5, 35.0, 37.5, 40.0, 42.0, 44.0, 46.0, 48.0]
         }
     }
diff --git a/datasets/assetData/curves/pik300.json b/datasets/assetData/curves/pik300.json
index 2c6f58e..bc02133 100644
--- a/datasets/assetData/curves/pik300.json
+++ b/datasets/assetData/curves/pik300.json
@@ -1,36 +1,39 @@
 {
     "_meta": {
-        "supplier": "Unknown (PIK/PRK family)",
+        "supplier": "Sulzer ABS",
         "type": "Disc",
         "model": "PIK300",
-        "stdAir": { "temp_C": 20, "pressure_bar": 1.01325, "RH_pct": 0 },
+        "membrane": "Perforated EPDM",
+        "membraneArea_m2_per_element": 0.07,
+        "membraneArea_m2_per_element_note": "Sulzer ABS PIK/PRK 300 mm fine-bubble disc, ~295 mm active membrane diameter (π × 0.1475² ≈ 0.068 m², rounded to 0.07 m²). Confirm against Sulzer spec sheet if available.",
+        "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
         "coverageBasis": "bottom-coverage-pct",
         "coverageReference": [5, 10, 15, 20, 25],
         "dataQuality": "multi-coverage",
-        "xAxisBasis": "per-element-Sm3h",
+        "xAxisBasis": "per-m2-membrane-Nm3h",
         "yAxisBasis": "ssotr-g-per-Nm3-per-m",
         "waterDepth_m": 4.0,
-        "source": "'PIK & PRK300 data from QM.xlsx' (Sheet1). Two paired models PIK300 and PRK300: identical SOTE/SSOTR curves at DD 5/10/15/20/25 %, separate DWP curves per model. Water depth inferred from the relationship SOTE[%] = SSOTR[g/(Nm3*m)] * depth_m * 100 / 0.2786 kg-O2/Sm3 — gives depth ≈ 4.0 m for every row when standard-cubic-meter mass is taken at 20 °C / 1013.25 mbar.",
-        "note": "X-axis air flow uses 'Sm3' (US standard, 20 °C / 1013.25 mbar) rather than 'Nm3' (DIN, 0 °C). The existing diffuser specificClass internally normalises to 20 °C — so the values are usable as-is with that convention. SOTE [%] values are the raw spreadsheet entries; otr_curve is the per-meter SSOTR g/(Nm3*m) already in canonical units."
+        "source": "'PIK & PRK300 data from QM.xlsx' (Sheet1). Sister model PRK300 shares the SOTE/SSOTR curves; only DWP differs (PIK300 = perforated EPDM, PRK300 = perforated PUR).",
+        "note": "Native data was Sm³/h/disc on X and g O₂/(Sm³·m) on Y (US standard, 20 °C, 1.204 kg/Sm³ → 278.6 g O₂/Sm³). Converted to canonical Nm³ basis (DIN-1343, 0 °C, 1.293 kg/Nm³ → 299.0 g O₂/Nm³): X × 0.9319 / 0.07, Y × 1.0732. Water depth ≈ 4.0 m falls out of the SOTE↔SSOTR ratio under Sm³ conventions — verify if precision matters."
     },
     "sote_curve": {
-        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [27.87, 26.99, 25.80, 24.97, 24.38, 23.89, 23.46, 23.12] },
-        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [30.18, 29.33, 28.15, 27.33, 26.73, 26.21, 25.83, 25.49] },
-        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [31.51, 30.53, 29.16, 28.27, 27.57, 27.01, 26.55, 26.15] },
-        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [32.52, 31.39, 29.88, 28.84, 28.06, 27.45, 26.92, 26.49] },
-        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [33.26, 32.04, 30.39, 29.27, 28.45, 27.77, 27.22, 26.76] }
+        "5":  { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [27.87, 26.99, 25.80, 24.97, 24.38, 23.89, 23.46, 23.12] },
+        "10": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [30.18, 29.33, 28.15, 27.33, 26.73, 26.21, 25.83, 25.49] },
+        "15": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [31.51, 30.53, 29.16, 28.27, 27.57, 27.01, 26.55, 26.15] },
+        "20": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [32.52, 31.39, 29.88, 28.84, 28.06, 27.45, 26.92, 26.49] },
+        "25": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [33.26, 32.04, 30.39, 29.27, 28.45, 27.77, 27.22, 26.76] }
     },
     "otr_curve": {
-        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [19.509, 18.893, 18.060, 17.479, 17.066, 16.723, 16.422, 16.184] },
-        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [21.126, 20.531, 19.705, 19.131, 18.711, 18.347, 18.081, 17.843] },
-        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.057, 21.371, 20.412, 19.789, 19.299, 18.907, 18.585, 18.305] },
-        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.764, 21.973, 20.916, 20.188, 19.642, 19.215, 18.844, 18.543] },
-        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [23.282, 22.428, 21.273, 20.489, 19.915, 19.439, 19.054, 18.732] }
+        "5":  { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [20.937, 20.276, 19.382, 18.759, 18.316, 17.947, 17.624, 17.369] },
+        "10": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [22.673, 22.034, 21.148, 20.532, 20.081, 19.690, 19.405, 19.149] },
+        "15": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [23.672, 22.936, 21.907, 21.238, 20.712, 20.291, 19.946, 19.645] },
+        "20": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [24.431, 23.582, 22.447, 21.666, 21.080, 20.622, 20.224, 19.901] },
+        "25": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [24.987, 24.070, 22.831, 21.989, 21.373, 20.862, 20.449, 20.104] }
     },
     "p_curve": {
         "0": {
-            "x": [1.5, 2,    3,    4,    5,    6,    7,    8],
-            "y": [25.5, 26.0, 27.5, 30.3, 34.0, 39.0, 45.0, 52.0]
+            "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49],
+            "y": [25.5,  26.0,  27.5,  30.3,  34.0,  39.0,  45.0,  52.0]
         }
     }
 }
diff --git a/datasets/assetData/curves/prk300.json b/datasets/assetData/curves/prk300.json
index ef04e21..0c4688f 100644
--- a/datasets/assetData/curves/prk300.json
+++ b/datasets/assetData/curves/prk300.json
@@ -1,36 +1,39 @@
 {
     "_meta": {
-        "supplier": "Unknown (PIK/PRK family)",
+        "supplier": "Sulzer ABS",
         "type": "Disc",
         "model": "PRK300",
-        "stdAir": { "temp_C": 20, "pressure_bar": 1.01325, "RH_pct": 0 },
+        "membrane": "Perforated PUR",
+        "membraneArea_m2_per_element": 0.07,
+        "membraneArea_m2_per_element_note": "Sulzer ABS PIK/PRK 300 mm fine-bubble disc, ~295 mm active membrane diameter (π × 0.1475² ≈ 0.068 m², rounded to 0.07 m²). Confirm against Sulzer spec sheet if available.",
+        "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
         "coverageBasis": "bottom-coverage-pct",
         "coverageReference": [5, 10, 15, 20, 25],
         "dataQuality": "multi-coverage",
-        "xAxisBasis": "per-element-Sm3h",
+        "xAxisBasis": "per-m2-membrane-Nm3h",
         "yAxisBasis": "ssotr-g-per-Nm3-per-m",
         "waterDepth_m": 4.0,
-        "source": "'PIK & PRK300 data from QM.xlsx' (Sheet1). Same SOTE/SSOTR curves as the PIK300 sibling; the PRK300 differs only in DWP characteristics.",
-        "note": "X-axis air flow uses 'Sm3' (US standard, 20 °C / 1013.25 mbar) rather than 'Nm3' (DIN, 0 °C). The existing diffuser specificClass internally normalises to 20 °C — so the values are usable as-is with that convention."
+        "source": "'PIK & PRK300 data from QM.xlsx' (Sheet1). SOTE/SSOTR curves identical to the sibling PIK300; the only difference is the DWP curve (PRK = perforated PUR vs PIK = perforated EPDM).",
+        "note": "Native data was Sm³/h/disc on X and g O₂/(Sm³·m) on Y. Converted to canonical Nm³ basis (DIN-1343): X × 0.9319 / 0.07, Y × 1.0732."
     },
     "sote_curve": {
-        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [27.87, 26.99, 25.80, 24.97, 24.38, 23.89, 23.46, 23.12] },
-        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [30.18, 29.33, 28.15, 27.33, 26.73, 26.21, 25.83, 25.49] },
-        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [31.51, 30.53, 29.16, 28.27, 27.57, 27.01, 26.55, 26.15] },
-        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [32.52, 31.39, 29.88, 28.84, 28.06, 27.45, 26.92, 26.49] },
-        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [33.26, 32.04, 30.39, 29.27, 28.45, 27.77, 27.22, 26.76] }
+        "5":  { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [27.87, 26.99, 25.80, 24.97, 24.38, 23.89, 23.46, 23.12] },
+        "10": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [30.18, 29.33, 28.15, 27.33, 26.73, 26.21, 25.83, 25.49] },
+        "15": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [31.51, 30.53, 29.16, 28.27, 27.57, 27.01, 26.55, 26.15] },
+        "20": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [32.52, 31.39, 29.88, 28.84, 28.06, 27.45, 26.92, 26.49] },
+        "25": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [33.26, 32.04, 30.39, 29.27, 28.45, 27.77, 27.22, 26.76] }
     },
     "otr_curve": {
-        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [19.509, 18.893, 18.060, 17.479, 17.066, 16.723, 16.422, 16.184] },
-        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [21.126, 20.531, 19.705, 19.131, 18.711, 18.347, 18.081, 17.843] },
-        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.057, 21.371, 20.412, 19.789, 19.299, 18.907, 18.585, 18.305] },
-        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.764, 21.973, 20.916, 20.188, 19.642, 19.215, 18.844, 18.543] },
-        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [23.282, 22.428, 21.273, 20.489, 19.915, 19.439, 19.054, 18.732] }
+        "5":  { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [20.937, 20.276, 19.382, 18.759, 18.316, 17.947, 17.624, 17.369] },
+        "10": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [22.673, 22.034, 21.148, 20.532, 20.081, 19.690, 19.405, 19.149] },
+        "15": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [23.672, 22.936, 21.907, 21.238, 20.712, 20.291, 19.946, 19.645] },
+        "20": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [24.431, 23.582, 22.447, 21.666, 21.080, 20.622, 20.224, 19.901] },
+        "25": { "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49], "y": [24.987, 24.070, 22.831, 21.989, 21.373, 20.862, 20.449, 20.104] }
     },
     "p_curve": {
         "0": {
-            "x": [1.5, 2,    3,    4,    5,    6,    7,    8],
-            "y": [21.3, 24.0, 29.3, 35.3, 41.3, 46.8, 52.4, 58.6]
+            "x": [19.97, 26.62, 39.93, 53.24, 66.56, 79.87, 93.18, 106.49],
+            "y": [21.3,  24.0,  29.3,  35.3,  41.3,  46.8,  52.4,  58.6]
         }
     }
 }
diff --git a/datasets/assetData/diffuser.json b/datasets/assetData/diffuser.json
index bbc4d3c..15158d8 100644
--- a/datasets/assetData/diffuser.json
+++ b/datasets/assetData/diffuser.json
@@ -34,8 +34,8 @@
             ]
         },
         {
-            "id": "aquaconsult",
-            "name": "Aquaconsult / Entec",
+            "id": "aquaconsult-entec",
+            "name": "Aquaconsult Anlagenbau (Entec)",
             "types": [
                 {
                     "id": "diffuser-strip",
@@ -51,15 +51,15 @@
             ]
         },
         {
-            "id": "pikprk",
-            "name": "PIK / PRK (vendor TBD)",
+            "id": "sulzer",
+            "name": "Sulzer ABS",
             "types": [
                 {
                     "id": "diffuser-disc",
                     "name": "Disc",
                     "models": [
-                        { "id": "pik300", "name": "PIK300", "units": ["Sm3/h", "Nm3/h"] },
-                        { "id": "prk300", "name": "PRK300", "units": ["Sm3/h", "Nm3/h"] }
+                        { "id": "pik300", "name": "PIK300 — perforated EPDM", "units": ["Nm3/h"] },
+                        { "id": "prk300", "name": "PRK300 — perforated PUR",  "units": ["Nm3/h"] }
                     ]
                 }
             ]
diff --git a/src/configs/diffuser.json b/src/configs/diffuser.json
index 14006b3..ad71fba 100644
--- a/src/configs/diffuser.json
+++ b/src/configs/diffuser.json
@@ -102,6 +102,14 @@
         "description": "Number of diffuser elements in the zone."
       }
     },
+    "membraneAreaPerElement": {
+      "default": null,
+      "rules": {
+        "type": "number",
+        "nullable": true,
+        "description": "Membrane area per element [m²] used to convert total airflow to canonical specific flux Nm³/(h·m² membrane) before curve lookup. Defaults to the selected curve's _meta.membraneArea_m2_per_element (Jäger 0.18, Sulzer 0.07, Aerostrip 1.0 normalisation). Set explicitly only to override the curve metadata."
+      }
+    },
     "density": {
       "default": 15,
       "rules": {