Membrane of 50 Gallons Per Day, This membranes are now available in residential sizes. Designed to perform in operating conditions similar to most standard under-the-counter home RO units, the ASFILTER TFC-1812-50 forms a tight fit in most standard residential housings. TFC-1812-50 performance data*: 60 Gallons Per Day @ 65 PSI 97% Rejection Rate Test under the condition thet the water temperature is 25ºC. the concentration of NaCI is 500 ppm. and ph to 7,5. Dimensions Overall Length (A): 29.8 cm. Membrane Length (B): 25.7 cm. Diameter (C): 4.5 cm