I don't know how many others have had/are having persistent algae problems. But for what it's worth, here's what I think is happening in my case.
Where have your hoses been? What have they been used for, prior to filling/adding water to your pool?
In my case, these hoses that we've been adding water to our pool with have been used for draining flooded basements.
Here's what's happening:
I get the algae killed, as in no overnight drop in FC, no CC. Then I add water to the pool. Next day, the algae is back with a vengeance.
If this sounds familiar, may I suggest a 50% mix of chlorine & water, poured into your hoses and left sit for a day with this in them. I'm thinking that the extreme amount of bleach in the hose would give extra killing power, without depleting to the point of "almost enough" to do the job.
Several times throughout the day, circulate the water in the hoses by simply lifting the hose and running the loop all the way around back to the coupling. If you left any air in the hose (hard not to!), the bubble will move the water around.
15' round 4.8K gal Intex AG pool; Intex 633 pump with twin canisters (2500 gph main filtering); Unicel 5315 filter cartridges; Intex 637 pump w/o filter (1000 gph heater circulation); 4hrs; K-2006; utility water; PF:24
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