Start with 15 jugs and see how that goes. Get the CYA up to a good thirty by slowly creeping up at @10 ppm at a time not to overshoot but start the slam immediately so not to let it get worse.
Previous replies have suggested that I would not need to SLAM, as the water in the pool is clear.Start with 15 jugs and see how that goes. Get the CYA up to a good thirty by slowly creeping up at @10 ppm at a time not to overshoot but start the slam immediately so not to let it get worse.
So long as you are sure that the pool won't float, I always go with more. You'd be surprised how easy it is to misjudge 50% and then you could need to drain more, removing good water with the bad.Since I'm hoping to only have to do this once for now, would there be any benefit to taking it down even further than that? Say, draining 90%?
If you lose FC overnight, then algae is brewing. ( Overnight Chlorine Loss Test ). On the plus side, cool and/or clear water SLAMs are always easier if we have to cross that bridge after filling. No matter how bad it may be, it'd be exponentially worse with a swamp and/or in July.Previous replies have suggested that I would not need to SLAM, as the water in the pool is clear.
The diluted CYA test has double the error variance, and it was bloody subjective in the first place. It could be higher than 140 and if you drained half at 160, you'd end up with 80. If you misjudged the half, it could be 90 or 100.Most are saying drain at least 50% with one person suggesting up to 70%.
You need:What other chems/quantities can I expect to need in the first few weeks?
Fill water has 0. How much did you end up draining ?When CYA is less than 30, how would you enter it in the app?
Drained it down pretty low. About 6-10 inches of water left before refilling.Fill water has 0. How much did you end up draining ?
You had less than 30 and have 16 being dissolved as we speak. Count it as 30 and if it registers higher in a few days, then go with that.
You will lose FC daily to the sun. The daily loss will slowly increase as the season ramps up. Your target will be minimum FC, plus *plenty* to make it to tomorrow, at any point of the season. If you're losing 2 ppm a day now, 4 ppm + minimum is a 2 day supply. When you're losing 4ppm a day in July, 4ppm is a 10am to 3pm supply.
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Once the daily loss increases, many of us run over target, so that when we fluctuate, we fall back into target range, versus starting in target range and landing below it.
Awesome. So your water is almost entirely fill water. It would need to mix for a day or so if it was 50/50 (etc) before we trusted the CH and CYA, but they're pretty much your fill values.About 6-10 inches of water left before refilling.
Ahh right. Saw Pool Math default to a target level of 75, but that 250 is recommended. The app says approximately 23lbs of Calcium Chloride. Seems like a lot. Would it make sense to add that in stages? Is it ok to add while still working on getting my FC and CYA dialed in, or should I focus on those first?With a plaster pool, raise the CH to 250 ppm.