Which membrane to purchase?

[PhLipStyLz]

Hi -

I purchased the Optima Chloramine Advanced system about 2 years ago, and I am now in the process in replacing all the filters for the 3rd time and the membrane for the first time.

Does the included Dual Inline TDS monitor need to be calibrated ever so often?

Thanks!
Philip

[dilligaf_biker69]

Yes It does need to be calibrated every so often.

I don't have the instructions in front of me but I know it does. If you need the instructions let me know of call.

Thanks,
Roy

[palawan]

Wow, I thought you only replace the RO membrane after 3 years and thats if you do not maintain the other filters each year and if you TDS from the RO membrane is over the 10% rule. Are you on well water?

[PhLipStyLz]

Roy, I do need the instructions... If you can find them that would be great! Does it require a calibration solution?

palawan - no i'm not on well water... but my TDS monitor is having a reading with an input 48ppm and an output of 25ppm? i'm not sure how accurate that is, so hopefully i can get it calibrated