how many gals per di change

[snake-062]

I'm currently getting about 50 gals of water per di cartridge change. I'm currently running a seachem 75 gal membrane with sediment filter carbon block and di resine. (city water 340 tds) Is this normal? curious as to what everyone else is getting per cartridge change

[downbeach]

When was the last time you replaced your membrane? Do you know what your reading is coming out of the membrane? If it's high it will use your DI resin more quickly.

Here is something posted by Matt of BFS:

http://i1226.photobucket.com/albums/ee410/Downbeach88/DIresinlifeatvariousrejectionrates_zpse78535ed.jpg

[snake-062]

membrane is about 8 months old . but aprox, fifty gals give or take a few is about max i can produce even with new membrabe. I will check the water coming out of my membrane , thanks for the advice.

[tmz]

The membrane may be seated in the cartridge poorly. I've had that problem. The washer material on the end can crinkle sometimes when you install it letting some unfiltered water pass by directly to the di resin which will exhuast it quickly.

[bertoni]

What is the TDS after the membrane?

[HUNTER1]

My BRS 4 stage is 4 months old and gotten around 500g from a city water of 480 TDS. My sediment filter is very dirty and DI resin is 75-100% brown. I just bought a TDS meter yesterday and the readings. Tap 480, out of membrane 18 and out of DI 0 TDS. I say something is not right with your system, 50g is nowhere near for DI replacement.

[snake-062]

tds after the membrane is 250.

[disc1]

tds after the membrane is 250.


The membrane may be seated in the cartridge poorly. I've had that problem. The washer material on the end can crinkle sometimes when you install it letting some unfiltered water pass by directly to the di resin which will exhuast it quickly.


I bet that's it.