nestor10@mindspring.com writes: > Knowing the output values is > important in order to determine if it's a single-resin (sodium/potasium > rechargeable? disposable/replaceable?) or dual-resin, as they both affect > the outcome in different ways. In my prior post i gave expected GH and KH from your DI/tap mix. But David has made a valid point here. I made the assumption you were using a quality KATI/ANI, two-stage DI unit. If you are only using a positive ion exchange/removal system, it may actually be the cause of you pH increases. Bob Dixon ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!