re: High CYA levels in a swimming pool.

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go from 300 ppm to 30 ppm, you need to replace 90% of the water with fresh to do it in one dilution. If you only throw out half the water each time, you'll replace about 150% of the water. If you do it by draining a quarter of the pool at a time, you'll replace the entire volume twice.

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Hence the tarp method I proposed

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pool

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professional

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In what parallel galaxy do these exist?

That tarp method is cool but it looks like it’s above my pay grade. I’m stil, trying to figure out how to turn off the line to the skimmer on this pump setup

Is there markings in the skimmer that says, "skim, main drain, and both"...?

Stain remover will negate all chlorine. Put a bottle of stain remover in it. You can start chlorine level over from scratch, plus the sides and bottom will look real clean

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Nah that’s the problem it’s not marked

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Shouldn't be hard to figure out. If the lever is centered, the PVC to both drain and skimmer should be open. Move it all the way in one direction and go check your skimmer to see if the water is being pulled in or not and there's your answer.

Use a label maker to put labels on it so you don't have to worry next time.

Eta take a pic and post it if you're still wondering.

And tfp website is going to be your best friend. Download the pool math app they wrote and this will make your life easier in the summer.

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If you have a built in pool made of concrete, or whatever they use, draining it may cause it to crack or pop out of the ground.


Yeah this is a concern. I think I’m going to have to hire somebody. I’m envisioning a thousand dollar bill getting set on fire with this.

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How do they keep it from cracking before the first time the fill it? Do that.

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Shouldn't be hard to figure out.

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You’re right it wasn’t hard. I’m just drainin this bitch. With the garden hose running into it at the same time. Invigorating.

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300 ppm cya is absurd. Your chlorines level would have to be like 20 ppm to sanitize at that level.

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All of this is true. So make sure you have an ACCURATE reading. From a decent test kit NOT a strip tester. Strips are really for spot checks after you know what you are doing. Take a water sample to a pool store ONLY to get accurate readings. Dont buy the $300 worth of shite they say you NEED. I believe the chemicals that remove CYA are a bit pricey and labor intensive. When you can just drain the water.

Draining a pool down here??? I hope someone has mentioned to not completely drain a pool down here below or at sea level. You will possibly have an explosive above ground pool. With all the rain we have been getting I'd be cautious draining half of a pool. Drain down a couple feet and refill. While it is drained you can work on coping tiles.

MAy have to drain 2-3 times to get the levels down.

You can also look into the BBB method. It will tell you to chlorinate using only Clorox Bleach. Bleach does not leave CYA. It only raises chlorine levels. The negative CYA is a stabilizing agent. IT allows chlorine to remain in the pool. If you are pouring bleach into a pool at noon in august, you may as well be pissing into the pool. The sunlight eats the chlorine.

They probably winterized the pool to try to have a pool that opens with clearer water. If there's no chlorine you're going to have a green pool when you open it. Just chill out. It's not the time of year to worry about the chlorine levels in your pool.

ETA: You didn't list your location.

You could also pay a pool company for a visit to address the issue.

The discussion turned to chlorine and I ran with that. A CYA at that level is another matter to deal with and more difficult than just high chlorine levels.