Filmtec TW30-1812-24 RO Reverse Osmosis Membrane, 1-Pack

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Price: $29.25 $23.50   

Product Feature

• 98% Stabilized Salt Rejection (Minimum Rejection 96%)
• NSF/ANSI Standard 58 listed
• Membrane Dimensions: 11.75" Overall Length, 1.75" Diameter (Fits Standard 2" ID Membrane Housings)

Product Description

Dow Filmtec TW30-1812-24 RO Reverse Osmosis Membrane This membrane is rated at 24 Gallons per Day. If you have chlorinated water, we recommend you use a Carbon/Sediment Pre Filter. The residual chlorine in municipal or city water will destroy the Thin Film Composite (TFC) membrane. Dow Filmtec TW30-1812-24 Reverse Osmosis Membrane elements are for home drinking water. The industry's most reliable advanced membrane technology and automated fabrication, allow these elements to deliver consistent performance that equipment suppliers, water treatment dealers and residential customers can rely on. This membrane fits in standard 1.8" x 12" residential RO membrane housings. The industry's most reliable for home drinking water is the Filmtec reverse osmosis membrane elements. Advanced membrane technology and automated fabrication in the Filmtec reverse osmosis membrane allow these elements to deliver consistent performance for all customers. Filmtec reverse osmosis membrane TW30-1812-24 element is NSF/ANSI Standard 58 listed. Filmtec home drinking water elements are rated at 50 psi and will purify about 20% more water than competitive elements rated at 60 psi. Because of environmental factors actual production may vary.

Filmtec TW30-1812-24 RO Reverse Osmosis Membrane, 1-Pack Review

I just spent the better part of the last two days trying to figure out why my RO system (Watts WP-4V from Costco) was draining all the water out of the storage tank after I had shut off the water supply to it (this was in response to the tank not filling after 12 hours of constant running.) I did the online searches and followed all the FAQs and surely thought that my auto shutoff valve had a leak allowing the purified water to drain into the sink. I was ready to buy a replacement ASV (even though the old one looked ok) and a pressure gauge to check my supply pressure, etc., then I remembered I had a spare Watts membrane and thought it was worth a shot. Guess what? It worked! The storage tank was no longer emptying on its own (I put it on a scale and the weight didn't change over several minutes).

So what was the cause? I had bought a Filmtec membrane thinking I could save a few bucks over the Watts version. Dimensionally they are identical, except the Filmtec has an outer brine rubber seal on the "wrong end" of the cartridge. This seal was held on with tape so I untaped it and moved the seal to the other end just like the Watts. I thought I was so clever! But then I read a review by "Maui73" who had the same issue as me. He confirmed there is also an internal check valve on the Watts version. Makes total sense now.. thanks Maui73!... wish I had seen your info sooner to save me $30.

Incidentally, my TDS for the two membranes were as follows (measured months apart):
Watts: Tap:250 RO:20
Filmtec: Tap:209 RO:48

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