Your chlorine needs to be between 3 and 6 ppm at all times, with your CYA at 30. You likely have an algae bloom trying to happen, so your first step would be to shock the pool--bring your chlorine up to 15 ppm (we normally recommend--and use--bleach for that purpose). Hold the chlorine at 15 ppm by testing and adding more bleach as needed to maintain that high chlorine level. You need to maintain it until the pool clears and until you can go from one night to the next morning without losing any chlorine. At that point, you can let the chlorine drift back down to the 3-6 range.
If you'll put your pool info in the chart here, it will help us give you better advice.
Pool Chart Entry Form
If you'll list your pool's volume we can help you figure doses to achieve your chlorine levels.This is going to require that you be able to do your own testing. Not with strips, but with drop-based testing. Do you have a good test kit? If not, go to your local WalMart and see if they have the hth 6-way drop kit (sells for around $20). If not, then at the very least get the cheapie OTO kit (uses red and yellow drops for pH and chlorine). The chlorine only will read up to 3 or 5 ppm, but we can explain how to force it to read higher, once you get it. It would also be helpful to us if you'll tell us what chems you have on hand/what you've used in the pool (ingredients, not just product names like "shock".)
Many people have algae blooms right after rainstorms and blame it on the rain--but it's really from the fact that people just don't tend to their pools in the rain like they do when it's sunny!
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