OK, when cleaning a pool of algae, you need to run the pump 24/7, and be dosing it with chlorine pretty much constantly. In practical terms this means 3x/day or minimum 2x. You have to vacuum to get the junk out, and back wash a lot, too.
Once it's clean and the chemicals are all nicely balanced, you need to "turn over" your water at least once per day. How long that takes depends on the gallons per minute your pump and filter run at, and how many gallons you have. For example, say you have 10,000 gallons and your pump and filter run at 25gpm: You need to run the filter for at least 7 hours to filter all the water once. I just made up these numbers.
You should also get a leaf rake. This is a gadget that looks like someone welded a squeegee to a butterfly net and goes on a standard skimmer pole. You need to drag this across the bottom, even if you can't see it, and get those leaves out of there! They are decaying and using up your chlorine.
Carl
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