RO/DI questions (1 Viewer)

[Jposch]

I have read running 90 psi is the red line and might affect the seals in the longer run. 85 psi is the sweet spot

Not for the commercial… the stuff we have

Yeah. 90psi is about the limit. The seals will hold, but the membrane will get ruined if I go much higher. My tap water is hard, had high silicate and fairly high chlorine. I think they recently switched to chloramine now, but when I started running catalytic carbon for the first carbon stage, that seemed to really extend membrane life and enhance rejection rate. My membrane is giving me like 99.7% rejection these days. Above the advertised rate.

 

[HouseofStark]

Also I got marketing suckered into the 200 gallon water saver bla bla in which the 2 x 100 gallon RO membrane are daisy chained. Until I heard Ben say in a reef beef podcast that you are basically burning through more DI…I do make crap ton of water really fast with the booster pump though

Was looking to "upgrade" my gpd to the 200 gpd. Was looking for the reef beef episode...what was he saying? Less rejection....ends up burning through more di?

Can disregard. I did end up finding it episode 142, 1hr mark. Spoiler, he states 2nd memebrane takes on higher tds, because its source water comes from the rejected and non processed water from 1st membrane. Is it doing more work, yes....but I feel he fell into his own trap also about generalizing peoples water quality. I feel I have decent water quality and getting good life and amounts out of the stacked method. I have 5 TDS meters on my unit to keep an eye on TDS, RO memebranes are 4+ years old, DIs are 2 or so years old.

 

[Jposch]

Was looking to "upgrade" my gpd to the 200 gpd. Was looking for the reef beef episode...what was he saying? Less rejection....ends up burning through more di?

Can disregard. I did end up finding it episode 142, 1hr mark. Spoiler, he states 2nd memebrane takes on higher tds, because its source water comes from the rejected and non processed water from 1st membrane. Is it doing more work, yes....but I feel he fell into his own trap also about generalizing peoples water quality. I feel I have decent water quality and getting good life and amounts out of the stacked method. I have 5 TDS meters on my unit to keep an eye on TDS, RO memebranes are 4+ years old, DIs are 2 or so years old.

The 75gpd membranes have highest rejection. Depending on your situation, water bill, whats in the water, etc. Running dual 75s, 100s, burn more resin, water softener, on and on should be tailored to your area's water. Just like "one size fits all gloves," someone apparently has the ideal setup as-is, but many not. Lol