Why is My POOL Still GREEN, Even After Shocking? (And How to Fix It) | Swim University

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Can’t seem to get rid of algae in your pool? Adding a double dose of shock is usually enough to kill algae and clear up green water. But what if your water is still green, even after shocking? Here are FIVE common reasons why that might happen:

#1. You didn’t add the right amount of shock or you added it the wrong way.
#2. Your pH or CYA is out of range.
#3. You’ve got hidden algae spores on your surfaces and inside your filter.
#4. You’re not running your pump and filter enough.
#5. You’ve got copper in your water that’s turning it green – and it’s not even algae.

So here’s how to solve each of these issues and get rid of green water for good.

⏰ Timestamps:
00:00 - Why is My Pool Still Green?
01:07 - #1. Add Shock Correctly
02:34 - #2. Balance pH and CYA
03:05 - #3. Remove Algae from Surfaces and Filter
03:40 - #4. Run Pump and Filter Longer
04:24 - #5. Check for Metals
05:05 - Using Flocculant
05:45 - How to Keep Algae from Coming Back

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Swim University has made swimming pool and hot tub care easy for more than 10 million homeowners. And each year, we continue to help more people with water chemistry, cleaning, and troubleshooting. We know taking care of a swimming pool or spa can be difficult. And it’s hard to find a trusted source of information. We get it! This is the reason we created Swim University.

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