Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

LOW PRICES and FAST SHIPPING SINCE 1999 !

99.5% Of All Items In Stock For Same Day Shipping!

Membrane Trouble

RO Membrane Trouble Shooting For The Newly Installed Reverse Osmosis Membrane

Many parameters change during the changing of the RO membrane and filters in a reverse osmosis drinking water system. First, new filters and membrane creates a different water pressure than was present before the change. This is due to the freer flow from the filters and the new membrane.

Always sanitize the system when changing filters and membrane. See our online guide for sanitizing your RO system. Bacterial growth or Biofilm can come from contact with your hands or other means of contact.

We can't find products matching the selection.

Easy TDS Membrane Performence Calculator
See If It is Time To Replace Your Membrane

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.