CYA high, getting too hot to drain?

biotron2000

Member
Apr 9, 2022
20
Bakersfield, CA
Pool Size
22000
Surface
Plaster
Chlorine
Liquid Chlorine
Hi, first post here.

My pool guy stopped showing up, it got green and I decided to try and maintain it myself.
It's roughly 22,000 gallons, built in late 70s/early 80s.
Looks like the pump and filter were replaced before my wife bought the house in 2014 (it was a flip).
3/4 HP Waterways pump, Sta-Rite System 3 filter (7).
I discovered the 3-way valve (bottom drain/skimmer) was broken inside. I had to redo the plumbing from the pump to the filter. Capped off the bottom drain for now (getting conflicting info about usefulness and safety). The skimmer does not connect to the bottom drain; there is a port with a vented cap in the pool wall just below it.
I bought a Vac Mate so I could run the skimmer and vacuum at the same time. Vacuum is a Hayward 4-wheel drive model, it works pretty well and it's only 3-4 years old. I've taken it apart a few times to clean it out if it gets clogged.

I have finally gotten the pool and water cleaned up as best I can. It's nice and clear now, but the chemistry is not ideal. Here's what I got from Leslie's:
pool.png

Phosphates were super high, I guess that's to be expected what with all the algae. I added half a quart of Orenda PR-10000 to try and get them down. Going to retest the water Saturday. CYA is off the charts, though. We have always used tablets instead of liquid chlorine for perceived convenience, but I realize now that's why the CYA is so high.

It has been about 5 years since the pool was drained.

Now, to finally get around to my question: Can I get through the season like this? My plan is to drain it in the fall. I would do it now, but the weather is heating up and expected to be in the 90s for a while, and here in Bakersfield, we do not have mild summers.

I could do a quick drain and refill, but a few tiles have fallen off and need to be reattached, and the light may need to be replaced (I'm going to check all the other wiring first. Already replaced the GFCI outlet and the switch. I am going to pull new wires from the junction box to the switch and to the GFCI. Couldn't hurt. It trips the GFCI after a few minutes or a few seconds. Bulb has been replaced and the housing is not leaking). So it will take me a few days if not a week to make the repairs.

Thank you for any advice!

Patrick
 
Welcome to TFP! :wave: You've done a lot already :goodjob: , but now it appears you have one important step to do ...... get your own proper test kit. Either a TF-100 (link in my signature) or Taylor K-2006C. You cannot trust those free tests. They are often incorrect. I suspect the CYA will be a first-stop area to address, but don't guess. Post results from your own test kit so we can help you save you time, money, and headaches. Then we can help you get all the chemistry in line. Until that time, be sure to add about 1/2 - 1 gallon of liquid chlorine to the water each day. A pool your size needs that much free chlorine, especially if the CYA is elevated.

 
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In B-Field this time of year, you don't want to leave the plaster exposed for too long. There are some other options to exchange water, just not as efficient. Ideally if you had to change water in the heat, rent a sump pump to pull it out quickly, then refill as soon as you can overnight. But you also appear to have some maintenance issues to contend with, so you'll have to work with those issues as well. It sounds as though you know our feeling on "guess-strips", so just be sure to have a good teat kit in-hand before you start so that you don't waste time or money with your processes. A precise CYA test is quite important.
 
In B-Field this time of year, you don't want to leave the plaster exposed for too long. There are some other options to exchange water, just not as efficient. Ideally if you had to change water in the heat, rent a sump pump to pull it out quickly, then refill as soon as you can overnight. But you also appear to have some maintenance issues to contend with, so you'll have to work with those issues as well. It sounds as though you know our feeling on "guess-strips", so just be sure to have a good teat kit in-hand before you start so that you don't waste time or money with your processes. A precise CYA test is quite important.

Ordering the TF-100 kit as we speak. :)
 
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In the sun you will lose some CYA. So if you keep on maintenance you might find the CYA is down to 80 or so by the end of the summer so you wont need to drain.

You should read pool school. Generally speaking phosphates are irrelevant so long as you have enough FC. You shouldnt need to use phosphate remover.
 
Answer to your empty pool question depends on the local water table. If high, yes it's bad. If low, then a few days probably OK. Phosphates a not a big issue, but if you must treat, I think you selected the right product. If your pool store free chlorine is correct, you need to get some liquid chlorine pretty quick and if your CYA is close to correct, you need your free chlorine at the 8-11 ppm range or your high phosphates are going to feed the imminent algae invasion headed your way. pH is good. Calcium a little high. But then your own tests will give you real numbers. Getting some liquid chlorine (pool chlorine not laundry bleach) in the pool can't hurt and is the only emergency as I see it.
 
Went ahead and drained the pool, chlorine washed the sides and bottom, and refilled. We are not on a water meter yet, but they are supposed to install one in the coming months. Might as well do it while I can. Changed the light fixture while it was empty, so it worked out for the best. Thanks for the advice!
 

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Biot
Once filled you can't afford to let it sit. You need to get 30 ppm of granular stabilizer as per poolmath in to the water via the sock method and also 5ppm liquid chlorine into the water. Without any stabilizer the half life of the chlorine is mighty short.
 
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