gre Posted October 25, 2022 Report Share Posted October 25, 2022 Hi there! Had a few situations lately that left the spa unattended to for some extended periods of time, and I had one with probably a week, and another with probably two weeks, of time with the chlorine to zero. I'm trying to make sure I am safe for use going forward... I added up to 10ppm chlorine, let it circulate a few hours, then drained and refilled, cleaned out the filters, some scum around the water line, etc. Refilled and shocked to 10ppm chlorine, and it was already down to 1.8 ppm the next day, and I've been adding chlorine to 6ppm daily since, and the chlorine demand is definitely leveling off, around 2.something ppm per day. I used it last night and so far so good, I hope. Will this be ok? How likely are biofilm problems? If there is some biofilm here and there is that a major problem as long as FC levels are ok? Or is using it the next few days asking for trouble? Thank you! Quote Link to comment Share on other sites More sharing options...
dashmer Posted October 26, 2022 Report Share Posted October 26, 2022 I think as long as you have FC in the water when you are using it, you should be fine. If your chlorine demand is reasonable, I wouldn't worry about it until your next water change, at which time you should do a purge with a good product like ah some. Quote Link to comment Share on other sites More sharing options...
gre Posted October 26, 2022 Author Report Share Posted October 26, 2022 Thank you for the reply! That's kind of what I thought, but wanted to be 100% sure. There was some brown scum around the water line the day after the refill, and I cleaned it off again and cleaned out the filters which were full of it, but I think that may have been some rust or something from some of the jet openings. Of course this begs the question, what is a "reasonable" chlorine demand? Thank you! Quote Link to comment Share on other sites More sharing options...
gre Posted October 26, 2022 Author Report Share Posted October 26, 2022 And FYI, for the discussion, my chorine demand was 2PPM from last night till this morning... I measured it at 5 last night using the K-2006 kit and at 3 ppm this afternoon. My spa is 450 gallons. Quote Link to comment Share on other sites More sharing options...
dashmer Posted October 27, 2022 Report Share Posted October 27, 2022 Was this measurement taken with no bather load affecting the chlorine use? Quote Link to comment Share on other sites More sharing options...
gre Posted October 27, 2022 Author Report Share Posted October 27, 2022 Yes, no bather load between those two readings. Quote Link to comment Share on other sites More sharing options...
dashmer Posted October 27, 2022 Report Share Posted October 27, 2022 Then I would say reasonable. Quote Link to comment Share on other sites More sharing options...
gre Posted October 28, 2022 Author Report Share Posted October 28, 2022 That's what I thought and hoped. Thank you for the replies and the confirmation! Quote Link to comment Share on other sites More sharing options...
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