ok so iv done first flush, my psi is 30 without a booster pump ( iv just ordered the one the aquatec 8800) so at 30 psi after 1 hour my tds was 35 from about about 400. my question is what was you tds before you put the booster pump on! and how long did it take for the membranes to bed in. and how much did the booster pump add to the droping of the tds txx:hehehe: what tds should i be happy with considering such a high tds start point.