RO Temperature Pressure Effects

The output of an RO system can be affected by both the water temperature and its pressure. The chart below shows the output factors for temperatures and pressures surrounding the 77°F, 65 psi standard.

Select your water temperature and pressure, then multiply the factor times the rated output of your membrane.

	35 PSI	40 PSI	45 PSI	50 PSI	55 PSI	60 PSI	65 PSI	70 PSI	75 PSI	80 PSI	85 PSI	90 PSI	95 PSI	100 PSI	105 PSI	110 PSI
45°F	0.232	0.265	0.299	0.332	0.365	0.398	0.431	0.464	0.497	0.531	0.564	0.597	0.630	0.663	0.696	0.730
46°F	0.242	0.276	0.311	0.345	0.380	0.414	0.449	0.483	0.518	0.553	0.587	0.622	0.656	0.691	0.725	0.760
47°F	0.251	0.287	0.323	0.359	0.395	0.431	0.467	0.503	0.539	0.574	0.610	0.646	0.682	0.718	0.754	0.790
48°F	0.261	0.298	0.335	0.373	0.410	0.447	0.484	0.522	0.559	0.596	0.634	0.671	0.708	0.745	0.783	0.820
49°F	0.270	0.309	0.348	0.386	0.425	0.464	0.502	0.541	0.580	0.618	0.657	0.695	0.734	0.773	0.811	0.850
50°F	0.280	0.320	0.360	0.400	0.440	0.480	0.520	0.560	0.600	0.640	0.680	0.720	0.760	0.800	0.840	0.880
51°F	0.290	0.331	0.372	0.414	0.455	0.496	0.538	0.579	0.621	0.662	0.703	0.745	0.786	0.827	0.869	0.910
52°F	0.299	0.342	0.385	0.427	0.470	0.513	0.556	0.598	0.641	0.684	0.727	0.769	0.812	0.855	0.897	0.940
53°F	0.309	0.353	0.397	0.441	0.485	0.529	0.573	0.617	0.662	0.706	0.750	0.794	0.838	0.882	0.926	0.970
54°F	0.318	0.364	0.409	0.455	0.500	0.546	0.591	0.637	0.682	0.728	0.773	0.819	0.864	0.909	0.955	1.000
55°F	0.328	0.375	0.422	0.468	0.515	0.562	0.609	0.656	0.703	0.749	0.796	0.843	0.890	0.937	0.984	1.030
56°F	0.337	0.386	0.434	0.482	0.530	0.579	0.627	0.675	0.723	0.771	0.820	0.868	0.916	0.964	1.012	1.061
57°F	0.347	0.397	0.446	0.496	0.545	0.595	0.644	0.694	0.744	0.793	0.843	0.892	0.942	0.992	1.041	1.091
58°F	0.357	0.408	0.459	0.509	0.560	0.611	0.662	0.713	0.764	0.815	0.866	0.917	0.968	1.019	1.070	1.121
59°F	0.366	0.419	0.471	0.523	0.575	0.628	0.680	0.732	0.785	0.837	0.889	0.942	0.994	1.046	1.099	1.151
60°F	0.376	0.429	0.483	0.537	0.590	0.644	0.698	0.752	0.805	0.859	0.913	0.966	1.020	1.074	1.127	1.181
61°F	0.385	0.440	0.495	0.550	0.606	0.661	0.716	0.771	0.826	0.881	0.936	0.991	1.046	1.101	1.156	1.211
62°F	0.395	0.451	0.508	0.564	0.621	0.677	0.733	0.790	0.846	0.903	0.959	1.015	1.072	1.128	1.185	1.241
63°F	0.404	0.462	0.520	0.578	0.636	0.693	0.751	0.809	0.867	0.924	0.982	1.040	1.098	1.156	1.213	1.271
64°F	0.414	0.473	0.532	0.592	0.651	0.710	0.769	0.828	0.887	0.946	1.006	1.065	1.124	1.183	1.242	1.301
65°F	0.424	0.484	0.545	0.605	0.666	0.726	0.787	0.847	0.908	0.968	1.029	1.089	1.150	1.210	1.271	1.331
66°F	0.433	0.495	0.557	0.619	0.681	0.743	0.804	0.866	0.928	0.990	1.052	1.114	1.176	1.238	1.300	1.361
67°F	0.443	0.506	0.569	0.633	0.696	0.759	0.822	0.886	0.949	1.012	1.075	1.139	1.202	1.265	1.328	1.392
68°F	0.452	0.517	0.582	0.646	0.711	0.775	0.840	0.905	0.969	1.034	1.099	1.163	1.228	1.292	1.357	1.422
69°F	0.462	0.528	0.594	0.660	0.726	0.792	0.858	0.924	0.990	1.056	1.122	1.188	1.254	1.320	1.386	1.452
70°F	0.472	0.539	0.606	0.674	0.741	0.808	0.876	0.943	1.010	1.078	1.145	1.212	1.280	1.347	1.414	1.482
71°F	0.481	0.550	0.619	0.687	0.756	0.825	0.893	0.962	1.031	1.100	1.168	1.237	1.306	1.374	1.443	1.512
72°F	0.491	0.561	0.631	0.701	0.771	0.841	0.911	0.981	1.051	1.121	1.192	1.262	1.332	1.402	1.472	1.542
73°F	0.500	0.572	0.643	0.715	0.786	0.857	0.929	1.000	1.072	1.143	1.215	1.286	1.358	1.429	1.501	1.572
74°F	0.510	0.583	0.655	0.728	0.801	0.874	0.947	1.020	1.092	1.165	1.238	1.311	1.384	1.456	1.529	1.602
75°F	0.519	0.594	0.668	0.742	0.816	0.890	0.964	1.039	1.113	1.187	1.261	1.335	1.410	1.484	1.558	1.632
76°F	0.529	0.604	0.680	0.756	0.831	0.907	0.982	1.058	1.133	1.209	1.284	1.360	1.436	1.511	1.587	1.662
77°F	0.539	0.615	0.692	0.769	0.846	0.923	1.000	1.077	1.154	1.231	1.308	1.385	1.462	1.539	1.615	1.692
78°F	0.548	0.626	0.705	0.783	0.861	0.940	1.018	1.096	1.174	1.253	1.331	1.409	1.488	1.566	1.644	1.722
79°F	0.558	0.637	0.717	0.797	0.876	0.956	1.036	1.115	1.195	1.275	1.354	1.434	1.514	1.593	1.673	1.753
80°F	0.567	0.648	0.729	0.810	0.891	0.972	1.053	1.134	1.215	1.296	1.377	1.459	1.540	1.621	1.702	1.783
81°F	0.577	0.659	0.742	0.824	0.906	0.989	1.071	1.154	1.236	1.318	1.401	1.483	1.566	1.648	1.730	1.813
82°F	0.586	0.670	0.754	0.838	0.921	1.005	1.089	1.173	1.256	1.340	1.424	1.508	1.592	1.675	1.759	1.843
83°F	0.596	0.681	0.766	0.851	0.936	1.022	1.107	1.192	1.277	1.362	1.447	1.532	1.617	1.703	1.788	1.873
84°F	0.606	0.692	0.779	0.865	0.952	1.038	1.124	1.211	1.297	1.384	1.470	1.557	1.643	1.730	1.816	1.903
85°F	0.615	0.703	0.791	0.879	0.967	1.054	1.142	1.230	1.318	1.406	1.494	1.582	1.669	1.757	1.845	1.933
86°F	0.625	0.714	0.803	0.892	0.982	1.071	1.160	1.249	1.339	1.428	1.517	1.606	1.695	1.785	1.874	1.963
87°F	0.634	0.725	0.815	0.906	0.997	1.087	1.178	1.268	1.359	1.450	1.540	1.631	1.721	1.812	1.903	1.993
88°F	0.644	0.736	0.828	0.920	1.012	1.104	1.196	1.288	1.380	1.472	1.563	1.655	1.747	1.839	1.931	2.023
89°F	0.653	0.747	0.840	0.933	1.027	1.120	1.213	1.307	1.400	1.493	1.587	1.680	1.773	1.867	1.960	2.053
90°F	0.663	0.758	0.852	0.947	1.042	1.136	1.231	1.326	1.421	1.515	1.610	1.705	1.799	1.894	1.989	2.083
91°F	0.673	0.769	0.865	0.961	1.057	1.153	1.249	1.345	1.441	1.537	1.633	1.729	1.825	1.921	2.017	2.114
92°F	0.682	0.780	0.877	0.974	1.072	1.169	1.267	1.364	1.462	1.559	1.656	1.754	1.851	1.949	2.046	2.144
93°F	0.692	0.790	0.889	0.988	1.087	1.186	1.284	1.383	1.482	1.581	1.680	1.779	1.877	1.976	2.075	2.174
94°F	0.701	0.801	0.902	1.002	1.102	1.202	1.302	1.402	1.503	1.603	1.703	1.803	1.903	2.003	2.104	2.204
95°F	0.711	0.812	0.914	1.015	1.117	1.219	1.320	1.422	1.523	1.625	1.726	1.828	1.929	2.031	2.132	2.234