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.


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

Water-Safe 5 Stage RO Water Filters ®

Water-Safe 5 Stage RO Water Filters ®

Water-Safe 5 Stage RO ® compatible replacement water filters and RO reverse osmosis membranes

1st Stage  5 Micron Sediment Pre Filter - Replace Every 3-6 Months 
2nd Stage 10 Micron Carbon Block or GAC Filter - Replace Every 12 Months 
3rd Stage 10 Micron Carbon Block Filter - Replace Every 12 Months
4th Stage 50 GPD TFC Reverse Osmosis Membrane - Replace As Needed - GPD Capacity Can Be Upgraded
5th Stage 10" Inline GAC Post Filter - Replace Every 12 Months

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.

* Water-Safe ® is the registered trademark of Water-Safe , the manufacturer of Water-Safe ® brand water treatment equipment.  The replacement filters and membranes listed above are not manufactured or endorsed by Water-Safe .  Rather, these filters and membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Water-Safe ® brand water treatment equipment, we make no representation as to whether using these filters and membranes is consistent with the warranty and specifications applicable to Water-Safe ® equipment.