This morning I had to go get an adapter for a different faucet so unhooked it while I ran to lowes. Took the pH just as I started it up and it was coming out 6.4. Used it to fill a 5 gallon bucket and the ph is back up to 9. Figured it may be the bucket so filler another small plastic cup(same way I checked it when I started it up), and the pH of the water coming out was 10.0. Seems like the longer I run it the higher the pH gets. Any ideas what might be causing this? Going to contact the manufacturer and the store I bought it from to try and get a replacement.

System is a Hydrologic StealthR0100
gbf4ever Reviewed by gbf4ever on . New RO system raising ph Just picked up a 100 gpd ro system. Ran it for about 40 minutes first to clean it out like the instructions said, then filled up a 5 gallon bucket. Ph'd the water after and the filter raised it from the 7.3-7.5 range to 10. Is this normal? Do I just need to let it run awhile to clean it out? Rating: 5