Why Won't My Pool Water Clear?

From https://www.swimmingpoolsteve.com/pages/fast-clean.html - Wondering why your pool water has turned green, and despite your best efforts, it just won't clear up? There are only so many reasons why your pool could or would turn green and if you start looking at your water chemistry numbers the answer should probably jump right out at you.
Some of the most common reasons for green water is low chlorine levels allowing for algae growth, high pH levels making chlorine much less effective, high levels of cyanuric acid (CYA) which is a stabilizer found in most chlorine tablets, high copper levels, etc. The best way to find out what is going on with your pool water and how to fix the problem is by getting a detailed water analysis done, often available at a local pool and spa store. Good filtration and proper water chemistry correction should clear up issues with persistently green pool water.

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