If it's green algae, and if you're using enough chlorine and persistance, it shouldn't take that long. But, we should be able to help get it cleared up, but we need to know some things:
1. what kind of algae is it (green, black, mustard)
2 How are you testing the water (you're going to need a drop-based kit, because strips aren't reliable enough to help you clear up a problem)
3. Can you please list for us all of the chems that you've put into the pool so far (please give ingredients, not just generic product names like "shock")
4. What do you normally use for chlorination?
5. Please list a complete set of test results on your water
6. Please take a few seconds to fill out this form about your pool and equipment--it will help save back-and-forth posts where we're trying to gather basic equipment
Pool Chart Entry Form
Pool Chart Results
Once we have the info we need, we'll be glad to help!!
Edit: After I modded in and answered this post, I found your other, duplicate post. I have merged the two together and will delete the other one, to try to keep it all in one place.
With a CYA of 90, you're going to need to shock the pool up to 20-25 ppm of chlorine, and hold it there by testing and adding more chlorine as necessary as many times a day as possible. You need to hold this level until you can go from sundown one night til just before sunup the next morning without losing more than 1 ppm of chlorine. This probably will take more than one day, so you're going to have to be persistent about it, but if you let the chlorine yo-yo up and down then you'll never get ahead of it and will have a perpetually green pool. After you can pass the overnight test, then hold it at shock level for one more day, then you can start letting the Cl drift back down, but never lower than 6 ppm. With your CYA that high, you're going to have to always keep the chlorine between 6-10 ppm to keep the algae gone. I would also suggest that you stop using stabilized chlorine, because that's usually what has driven the CYA up that high.
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