Recent content by DaveMcHbg

Thanks. Monopersulphate has had little effect and the cc here is rather persistent- last time slamming it took about 48 hours after maintaining a 10 ppm-fc, which took 24 hrs to reach, so it was a three day process. We can’t have the spa down that long, so- drain refill seems to be the...

Stupid sounding question, I know…but sincere. Draining an indoor spa which needs more time to oxidize the combined chlorine, when slamming, than I care to wait. This will be following an AA treatment for imbedded rust stains. So the question is this: Will leaving a percentage of existing...

Thanks for the input guys. (no cya use) The controller is an Aqua Balance with Pentair label on it. The redundant reader (old controller) is Pulse. The Aqua Balance unit controls both pH and Cl and is calibrated and cleaned monthly. It seems to be coming under control. Surprisingly the Cl...

Thanks Jason. I suspect the high pH occurred due to high cl. It was actually 7.0 (w/ cl at 1) before restarting the ORP feeder, which I intentionally left low (pH) following AA treatment and knowing it would rise with the addition of cl. I know these ORP readers are pH and Alk sensitive- one...

ORP reading vs test is WAY off. Can residual Hydrogen Peroxide, Ascorbic Acid, or Sequesterant cause this? Orp is reading in normal range- (fas Dpt)Test is 3x higher I shocked/ superchlorinated a spa (1000g) to break combined cl. Following that: Used H2o2 to drop cl levels. Used AA to remove...

Thanks, I appreciate the figures very much. I've opted to use the powder available from my local vitamin store (which is about $20 pr lb) for my first foray, I'll order a few # online for the pool if I get the spa results I'm looking for. Their 'potency' (content AA) is 1000mg per 1/4teaspoon-...

I am going to try AA stain treatment in an indoor spa: From searching and reading various postings, the closest I get to a consensus on the amount of Ascorbic Acid to use is 1 lb per 10,000 gal. suggesting that 1.6 oz (weight) would be appropriate amount for a 1000 gal spa. This seems like an...