I'm on Calgary water which is pretty hard but tons of reefers use it. I ordered my new membrane and restrictor from J&L and double checked to make sure they match.
I'm wondering if without a check valve, and evertime I use my RO water tap from my holding tank I have been pushing water from my DI resin back into my membrane and have plugged it up. The wierd part is that I have had this system for over five years with no problems until now. The only thing new is my membrane and my holding tank that I purchased from Home Depot. (the old one died)
I also have the flush kit.
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250 gal display tank plumbed directly to my wallet
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