There's Leslie's again....
Originally Posted by djbloodfiya
You probably have astronomical CYA from feeding the pool pucks and "shock." I believe they say something like 30-200 is "OK." It's not. Just to keep a clear pool staying clear at 200 CYA would require FC levels of 15-20. The preprinted sheets say 3 FC is "OK" No, it's not. Not if CYA is above 30. To kill Algae at 200 CYA would require 79 FC for several days. Pool School - Chlorine / CYA Chart What's your CYA? Do you trust their test results? What's your FC? You might not be anywhere close to killing algae, let alone keeping it at bay.
Something I wrote a couple years ago that might explain what you're up against. Some of my best writing.
We'll take a 16000 gallon pool, because that's what I have. On a fresh fill, prominent national pool chain recommends 2.5 pounds pf stabilizer per 10,000 gallons, which works out nicely to 4 pounds which brings CYA to 30. Your situation is not unique at all. Stay away from Leslies and get a proper test kit and take control of your pool and your wallet.
With an average loss of 2 PPM/Day or 14 ppm/week, I'll have added 8.6 PPM/CYA if I used trichlor pucks perfectly. And they recommend a weekly "shock" of dichlor between 5 and 10 FC.... 2-3 oz per 10,000 gallons. Split the difference; I'll add 4 oz. CYA went up another .9.
So..by the end of week one, I have added 9.5 more CYA. It is now 39.5. Mimimum FC for that is 3, so I'm probably okay.
Week two, up to 49 CYA.
Week three, 58.5. Minimum FC should be 5, but they recommend 3 as ideal, so the pool looks a bit hazy. So I'll toss in a little extra dichlor "shock" to jack FC up to 10. Which adds another 6.4 CYA. Keeping count? We're up to 64.9 now.
That caught the algae just in time.. we had two weeks of good luck. A steady diet of pucks and 4 oz. "shock" each week only added another 19, up to 73.9 now.
Week 6 it started looking funky, so we "shocked"it once again. CYA is up to 99.3. But minimum FC to keep algae at bay is 8, and we're still holding things to 3, because prominent national chain's preprinted sheet shows that as ideal. So algae got a toehold and the pool has a bit of a tint. So we throw two whole bags of dichlor in which jacks it another 7.6 by the time week 7 is over, we're at 116.4, because we had pucks in the floater the whole time.
So...in 7 weeks, from 30 to 116.4. Let's say there are no more algae outbreaks because they sold me a huge bucket of phos-free and another of yellow-out monopersulfate "shock" Nothing but the pucks and the extra 4 oz of dichlor "shock" weekly. So the next 7 weeks added 66.5, which brings the total to 182.9 CYA.
Now if we didn't understand this and things looked a bit hazy, we might throw an extra puck or two in the floater every couple weeks, which will drive it over 200 easily.
And then next year when you try to open, you're whining here how you "shocked" it and it's still green. And then you get indignant at the cost and bother to drain 3/4 of the pool. Seen it over and over and over and over here.