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Could be your backwash valve needs to be rebuilt. A picture of your valve and where and when you are seeing water would help too

AccuColor® Siliconized Sanded Acrylic Caulk | Tecspecialty.com

Sandro, email will from the post above yours. He has a good list of subs.

Your attachment link is broken.

Testing Cyanuric Acid with the TF-100 - YouTube

Did she do the test outside with her back to the sun and the tube held waist high? I doubt she did and that is how to do the test so yours is more accurate. There is a YouTube video on how to do the test if you are having doubts.

They do, most use Boric Acid instead due to the acid needed for Borax. Maybe search for that.

The request for a picture was to help me see if it was above or below the waterline as that effects the repair. Above the waterline you could use almost anything, below your choices are limited.

A SWG will raise the PH

Most vacuum installations recommend turning off the main drain or turning it almost off to avoid it getting stuck. I turned mine almost all the way off and my doesn't get stuck. I figure the vac is already sucking from the bottom of the pool so in essence it is acting as the main drain.

Did you test after sunset and then before sunrise? If not with no CYA your numbers could be off.

There is no way for us to tell exactly what each valve does. I can tell you the everything before the pump is suction and after the filter is a return. You will have to turn them on and off one at a time to check where the flow is coming from and going to and then label them.

You need to add some chlorine and some CYA. And what is your PH number? Use pool math to determine how much of each. Until you get CYA in there you are going to go through liquid chlorine quit quick.

Was it green prior to adding anything?

A picture of the area would help us help you. Also if your pool is only two your builder might fix it under warranty

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I meant wait for swim season to be over then when you start the closing process drain it low enough to get your CYA in line and then add water back to get to whatever level you need to be at for closing.

How do you winterize a pool? Maybe wait it out if that involves draining. Where I live we don't winterize so I'm clueless as the how to part on that.

What part of the country are you in?

Sounds like you already have your answer, if you are worried about it then it's a problem. If it makes the value harder to open have the company come back and fix it.

I'm not the local chemist of this fourm but I'm almost 100% sure liquid does not cause PH to rise any more than trichlor if it even causes it to rise at all.

The algae might be hiding behind it in the nook

I wouldn't add anything yet. Are you brushing at least daily? Do you have a light in your pool?

You can ask, we might not be able to fully answer without accurate test numbers though.

With being gone for a few weeks your choices are limited. Other than hiring a pool company to come or installing a chlorine dispensing pump you are stuck. You could just bite the bullet and load up some floaters and hope for the best. You might have to drain to lower the CYA at some point but at...

Are you sure the SWG is off? I wouldn't raise the CYA until you pass the overnight chlorine loss test. If your CC is correct you have something still in there.

You are correct 7.2PH and then bring on the bleach!

Most of those elbows don't appear to be schedule 40. If they are not then they are not rated for pressure.

What part of the country are you in? It could just be evaporating and the leak at the heater.

If you think it's an error in your testing than I'm sure any of us Vegas TFP users will make a stop to test and stare at the bling in awe. Me and my trash man would be thankful to not have some many MA bottles in the trash every week. I think my pool has slowed down on the consumption but the...