Long story short. I have a 80 gal deep blue rimless that I started to fill tonight. TDS where 0ppm for about 30 gals then went up to almost 70ppm. After pulling it all apart I found that the tds is not coming down after the Ro membrane. It goes in to the pre filter at about 180-190ppm TDS. It comes out of the ro at almost 130pp. I tired everything and I can not get it to come down. I have about 50 psi of psi. It is a sachem 200gpd. I am using an inline TDS meter. Can anyone stead any light on this I'm pulling my hair out and Id like to fill the rest of the tank.
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