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.

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Hellenbrand Water Filters ®

Hellenbrand Water Filters ®

Hellenbrand ®* Millennium MRO-35 Compatible Replacement Water Filters And Reverse Osmosis RO Membranes For Hellenbrand Reverse Osmosis RO Pure Drinking Water Systems.

Compatible replacements for:

Hellenbrand ®* Millennium MRO-35 S7128 Carbon Block Prefilter

Hellenbrand ®* Millennium MRO-35 S7125 GAC Carbon filter

Hellenbrand ®* Millennium MRO-35 S7206W-JG Inline Post Filter

Hellenbrand ®* Millennium MRO-35 S1448RS RO Reverse Osmosis Membrane

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.


* Hellenbrand ® is the registered trademark of Hellenbrand, the manufacturer of Hellenbrand ® brand water treatment equipment.  The replacement filters and membranes listed above are not manufactured or endorsed by Hellenbrand.  Rather, these filters and membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Hellenbrand ® 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 Hellenbrand ® equipment.