I opened my 15K Fiberglass SWG pool about 10 days ago and it has solid cover that keeps out sunlight so it opens fairly clean except for stains from dead worms that crawl under cover. I have been struggling with a leak for the last couple years that has meant adding well water and and that has required adding salt regularly and has generally made it harder to keep chemistry stable. When I measured alkalinity after opening it was 160 so I bought a bunch of HCL and have been lowering ph to 7 and I think I have it down to about 110-120. While I was focused on lowering alkalinity and preparing to patch potential leak near one of the return valves with water weld (I think pressure test identified leak at end of last season), I started to notice that chlorine levels were very low despite running chlorine generator at 60%. Normally I can keep chlorine at a good level by running generator 20-40% and I replaced the generator last year. Maybe I haven't been running pump as much as normal because leak is worse when pump is running and I hadn't been running it at night which is probably the best time to get chlorine without sun breaking it down. My cyanuric acid was really low so I added that (clorox stabilizer) and got that up to 30 yesterday but while I was patching the leak my wife commented that water looked a little yellow which got me thinking about the chlorine levels and wondering if algae could be why they weren't staying up. (I had added some bleach and a three bags of shock over the week after opening when I noticed chlorine not going up but I probably didn't add enough).
Last night after dark I put a little over 2 gallons of 10% bleach in pool and got chlorine up to 11.5. This morning (with pump off all night) I measured chlorine at about 8:00 AM so sun was up for maybe an hour and chlorine was at 10.5 (and cyanuric acid was at 30, maybe a little higher). There was some rain overnight. At about 4PM today I measured chlorine again and it was down to 6.5 despite me running pump all day with generator at 60%. It was sunny.
I just measured ph at 7.4 and added 2pts of HCl to bring ph down to 7 (still working on lowering alkalinity, chlorine generator brings ph back up fairly quickly). I have been having trouble measuring calcium hardness because color changes from red to not-red but more clear with blue or purple dots than blue. It turns from red to not red in the 250 range. Since I have been adding lots of non-softened well water with high iron content (I did add cartridge filter to try to reduce iron) I worry about iron content but when I have measured with strips it measures at about 1PPM. (The house is on city water, I left well for outside use which was before I got pool). A few days ago I added a bottle of metal sequestering agents (stain removal) and put a product in filter basket that is supposed to remove metals. I was pleasantly surprised that most of the worm stains went away after I did that, even some that wouldn't go away when I used a product that directly applied HCl to the stain.
As for the leak, I have been running pump all day without adding water and I feel like there may still be a leak but now I am wondering if I have algae. Pool doesn't look yellow anymore today and I have never known that I had an algae problem but the pool is on the north side of the house so I do get algae (or something green) on siding and nearby patio. I am considering raising my cyanuric acid level to the recommended 70 but I don't want to do that if I am going to have to SLAM the pool.
Last night after dark I put a little over 2 gallons of 10% bleach in pool and got chlorine up to 11.5. This morning (with pump off all night) I measured chlorine at about 8:00 AM so sun was up for maybe an hour and chlorine was at 10.5 (and cyanuric acid was at 30, maybe a little higher). There was some rain overnight. At about 4PM today I measured chlorine again and it was down to 6.5 despite me running pump all day with generator at 60%. It was sunny.
I just measured ph at 7.4 and added 2pts of HCl to bring ph down to 7 (still working on lowering alkalinity, chlorine generator brings ph back up fairly quickly). I have been having trouble measuring calcium hardness because color changes from red to not-red but more clear with blue or purple dots than blue. It turns from red to not red in the 250 range. Since I have been adding lots of non-softened well water with high iron content (I did add cartridge filter to try to reduce iron) I worry about iron content but when I have measured with strips it measures at about 1PPM. (The house is on city water, I left well for outside use which was before I got pool). A few days ago I added a bottle of metal sequestering agents (stain removal) and put a product in filter basket that is supposed to remove metals. I was pleasantly surprised that most of the worm stains went away after I did that, even some that wouldn't go away when I used a product that directly applied HCl to the stain.
As for the leak, I have been running pump all day without adding water and I feel like there may still be a leak but now I am wondering if I have algae. Pool doesn't look yellow anymore today and I have never known that I had an algae problem but the pool is on the north side of the house so I do get algae (or something green) on siding and nearby patio. I am considering raising my cyanuric acid level to the recommended 70 but I don't want to do that if I am going to have to SLAM the pool.
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