Rodi membrane ?

[toky916]

Hello guys I replaced my filters on my air water ice 75 GPD and the DI got bad really quick compared to before. I replaced filters today and tested just the RO and its 155 TDS from tap
And 4 TDS from the membrane is this still good for a 99% Rejection membrane like posted on there site ?

Thanks guys

 

[Saltwaternooby]

Seems better then 99% that would be closer to 15tds.

 

[toky916]

Well it's 98% effective.

Here is a Calculator link for anyone else who would like to know.
http://www.apswater.com/calcs.asp?Feed_conductivity=162&Product_conductivity=4

 

[Saltwaternooby]

Wow just realized i did 10% not 1%. Either way that seems acceptable to me.

 

[trhaynes]

Yeah looks good, sometimes there's stuff in the water that depletes DI really fast. When you say fast, how many gallons of water did you produce out of the DI?

 

[toky916]

About 500gal maybe it's cheep or bad DI that i got. My last one lasted me a really long time almost 1 1/2 years. I swiched out all the filters would u guys recomend running the old DI still has some life before the membrane in the third stage?

 

[trhaynes]

No, pre ro membrane the tds is going to be so high whatever is left will exhaust really fast! Personally 500 ish gallons is pretty good I think. Could have been old resin, or high co2 in the water.

 

[toky916]

Imo the 500gal is bad but could have been another issue with the prefilter some odd reason it's was 7tds out of the DI. saw more sand in then pre filter than ever before. Before i would check would not be as bad.
All better now could have been the filters bought them from a store not online like i do most of the time.