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So ... quick update as promised. O-Rings arrived today so as it was raining I disassembled the RO intending to swap O-rings only to discover that the ones specified are smaller than the ones fitted in the end caps from China. So, thanks to Doug@Daqua I left them fitted, and swapped over the...

Seriously? Thats crazy. Ours used to be 350 ish, but it's come down a bit (I'm in Warwick - Severn Trent Water - not sure where the water comes from though) I won't even drink our tap water. What with all the fluoride and stuff in it, it tastes horrible.

That's an interesting idea, Doug. I guess you are saying the end caps are reversible (makes sense). Didn't think of that. Not sure if the blank end will have O rings fitted - thats the "Brine seal" end, and has a plastic bung instead of the output port.. I have 5 new O rings arriving any day...

Yes, its a stainless steel housing with black plastic end caps.

Hi Doug, thanks for showing up. Forget the DI vessel for now, Not being funny, but its not part of this problem. Consider the DI vessel to be empty. I'm getting TDS of 60+. Somehow a small amount of drain water is finding its way past/around the membrane, and burning up my resin real quick...

I get my supplies from Doug at Daqua. Membrane is Axeon HF5. Resin is Tulsion MB115. 10" Carbon prefilter. I have only tested the TDS after DI, but considering the resin is totally shot, we can assume the TDS reading may as well be pre-DI (the resin is doing nothing)

I'll state the facts and the problem first, then my theory. Hopefully some of you might weigh in with some experience. Been using a Brodex system for 10 years, so not a novice. For about 6 months my resin has not been lasting as long as normal, so a month ago I changed the main RO membrane...