Hello All,
Been awhile since I have been on the forum -- lots going on.... Anyway, here is my setup: I have a "5 stage" RO under kitchen sync system. It has 4 Omnipure filters and a typical RO 50 gpd membrane.
Stage 1 sediment, Q5605
Stage 2 carbon, Q5621
Stage 3 carbon, Q5621
Stage 4 membrane (I have used various supplier membranes, typically Dow is my 1st choice)
Stage 5 GAC final filter, K2533KK
Typical set up with a 5 gallon holding tank, with a tee into refrigerator for ice/cold water. City water PSI is ~46 to 50 (have have a pressure gauge in-line), city water RDS is from 440 to 480, so I will say average 460. No permeate pump. System does have a auto shutoff valve (ASV) and I do have a green capillary drain flow restrictor installed on RO capsule drain line.
Observation and Question:
I recently changed all component filters/RO (2 weeks ago), a task I do once a year for all filters and I change the RO membrane once every 2 years. I know I could do the membrane less frequently, but this is my routine. After running a few tank fulls of RO water, after a 3 or 4 days, I am seeing TDS readings of 45 to 55 consistently (turn on RO water output, let run for 10 seconds, then take RO water sample in clean glass. Typically I would see 15 to 25.
While the TDS is much lower and perfectly okay to use, I feel I should be getting lower TDS measurements. Any troubleshooting ideas? Think I have a bad or sub-par RO membrane? Should I be changing the capillary drain flow restrictor?
Thanks in advance for any comments!!
Been awhile since I have been on the forum -- lots going on.... Anyway, here is my setup: I have a "5 stage" RO under kitchen sync system. It has 4 Omnipure filters and a typical RO 50 gpd membrane.
Stage 1 sediment, Q5605
Stage 2 carbon, Q5621
Stage 3 carbon, Q5621
Stage 4 membrane (I have used various supplier membranes, typically Dow is my 1st choice)
Stage 5 GAC final filter, K2533KK
Typical set up with a 5 gallon holding tank, with a tee into refrigerator for ice/cold water. City water PSI is ~46 to 50 (have have a pressure gauge in-line), city water RDS is from 440 to 480, so I will say average 460. No permeate pump. System does have a auto shutoff valve (ASV) and I do have a green capillary drain flow restrictor installed on RO capsule drain line.
Observation and Question:
I recently changed all component filters/RO (2 weeks ago), a task I do once a year for all filters and I change the RO membrane once every 2 years. I know I could do the membrane less frequently, but this is my routine. After running a few tank fulls of RO water, after a 3 or 4 days, I am seeing TDS readings of 45 to 55 consistently (turn on RO water output, let run for 10 seconds, then take RO water sample in clean glass. Typically I would see 15 to 25.
While the TDS is much lower and perfectly okay to use, I feel I should be getting lower TDS measurements. Any troubleshooting ideas? Think I have a bad or sub-par RO membrane? Should I be changing the capillary drain flow restrictor?
Thanks in advance for any comments!!