Easy TDS Membrane Performance Calculator

See If It is Time To Replace Your Membrane

Feed Water TDS

RO Water TDS

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Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests

Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.

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* Delta Fresh ® is the registered trademark of Delta Fresh, the manufacturer of Delta Fresh ® brand water treatment equipment. The replacement filters and membranes listed above are not manufactured or endorsed by Delta Fresh. Rather, these filters and reverse osmosis membranes are manufactured by other companies. While these filters and ro membranes are compatible for use in Delta Fresh ® reverse osmosis systems and water treatment equipment, we make no representation as to whether using these filters and membranes is consistent with the warranty and specifications applicable to Delta Fresh ® water filter equipment. This includes compatible replacement sediment water filters, replacement Carbon Block Water Filters, GAC Carbon Filters, AICRO Inline Post Filters, RO Reverse Osmosis Membranes, Sediment Pre Filters, faucets, water tanks, valves, pumps, UV Ultraviolet and water testing supplies.