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Used Super Shock, Calcium Hypo, 500 grams to 5 gal of water mix. And yes... I believe the way our spa was built is actually the issue, the chems are feeding back to quick rather then mixing .... however, the shock mix does not have the same drop of ORP as the sodium hypo. - - - Updated - - -...

Actually, I made a shock / water mix and the machine works EXACTLY as it is intended to. turns out that the problem was in fact the Sodium hypoclorite :D keep this in mind if anyone else ever experiences this same issue

No the feeders are located on the return line after the testing lines .... every time the ch pump goes on the orp drops immediately (after a few mins) and continues to drop until I shut the feeder off... then the orp rises as it should...(again after about 10 mins it starts) is it possible...

Hey everyone, id like to thank u in advance for any help or advice you may have on this issue. Recently we had a new CAT 2000 chemical control system installed for both our pool and spa the pool seems to work spot on, and the PH side works for both units as well. problem im having is when the...