It appears to be what remains of a 8 oz trichlor puck - 1 8oz adds about 2.6ppm FC and 1.6ppm CYA for 21,400 gals. So not much. And appears your FC burned off. I don't like putting it directly in a skimmer but many pool services do that. I use a floater if I have to use these pucks.Ok, I'm unsure what to do now. Of course the pool guy that was going to come by today didn't (actually, I'm 0 for 2 on pool guys today). I was getting ready to put CYA granules and liquid chlorine in b/c according to my tests, my CYA is 0 and FC and CC are .5. So I opened the skimmer and saw this...soooo multiple questions...
1. Can anyone tell what this is from the picture? Trichlor? Cal hypo? (Whatever it is I'm pretty sure the skimmer isn't the recommended location).
2. Should I raise CYA and FC based on what pool math told me to do anyway and leave this here? remove it?
3. Leave pool alone until pool guy maybe comes on Monday?
Thanks for any help...sorry for being so needy today, lol.
P.S. I washed my hands after touching this b/c it occurred to me that maybe I should have worn gloves.
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The good thing about zero CYA is that you do not have to have a very high FC to protect against algae but the bad part with no CYA, the FC burns off rather quickly. So it is important to raise CYA if you have sunny weather so you can maintain some level of FC in your pool.
Remember, if you add CYA, it may take 24-48 hrs to register on your tests, so do it in small batches if you do add CYA. If you have liquid chlorine, every gallon of 10% will raise FC by 4.7ppm. You can verify with your Pool Math app if you have a different % of LC. I used your pool volume of 21,400 gals.
It was OK to touch the puck, just wash your hands. What you do not know is if the pool service put 2 or 3 in the skimmer. With such a large volume, 1 puck has little to no effect as indicated by your test data.