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Read the section on "pump runtimes" here: https://www.troublefreepool.com/wiki/index.php?title=Pump_Basics#Pump_Runtimes

I see your signature. Thanks! You have a variable speed pump. No reason to run at high speed. You run your pump for a reason. Read the section on "pump runtimes" here: https://www.troublefreepool.com/wiki/index.php?title=Pump_Basics#Pump_Runtimes Make sure she knows how to decode chlorine...

You have low CYA. I have no idea what cell you have or output capacity or pump runtime. It is highly unlikely, even if you run a 2x cell size your pool volume you will not exceed SLAM level FC running for 24 hours at 80%. Chorine is king. Creating chlorine will stave off any algae growth you...

Pool Essentials Liquid Chorine from Walmart. Sure, you can up the SWG % tomorrow. Are you running 24/7? If so, set it to 80% output. Still need your signature to know your cell and output% and pump runtime to help you. Fill out your signature.

You have, at least, proven the reliability of the test. Good Job! You will get there and the angst and time will greatly reduce. In 6 mos., you will say pffft, testing? Easy.

Your best bet on short notice is Pool Essential Liquid Chlorine at Walmart.

Welcome to TFP!!! :shark: No way to tell. Either way it needs to be replaced.

Not worth another test. It is a learning curve, but it gets WAAAAAY easier. Fill out your signature when you get a chance. https://www.troublefreepool.com/wiki/index.php?title=Create_Your_Signature

Dude, you didn't print out or read the OCLT instructions. Really need FC to be greater than 3ppm. Do you have liquid chlorine? Then follow this from the OCLT instructions: If your FC is less than 3 ppm, add enough liquid chlorine to achieve 3 ppm FC, wait 30 minutes, then retest with the...

Turn the breaker to the pump OFF.

Turn the % to lowest. Wait 30 minutes with pump running, then do your first test.

One time event will not be a problem. No. Do not add it. We do not recommend algaecide.

What SWG do you have? Do you have automation?

WHEW! Great! Fingers crossed. Print out the OCLT directions and follow them. Tests must be AFTER sunset and BEFORE sunrise. Use weather on your phone for the times. Run pump 24/7, or at least 30 minutes before the tests.

For a 20K pool, 8-10 is fine to start. You may need more or less.

We don't want to raise CYA until after we do OCLT. Higher CYA makes SLAM harder and more expensive. Did you add it? How much did you add in ppm? How did you add it?

Take the diverter out and try running the pump, see what happens.

Sorry this happened...do you know how it happened? No, you cannot leave it off, it needs to be corrected, it is dangerous.

If the water is not a swamp, no need to dump. When doing pH adjustments, do it in .4 reductions. Larger reduction calculations are not accurate. Lower .4, pump running, test 30 minutes later. Repeat until your pH is in the 7s. Can you go test pH again now?

It is low. BUT DO NOT ADD ANYMORE RIGHT NOW. LET'S DO THE OCLT TONIGHT. Adding more now will make slam harder. We want to rule out algae before you add more CYA. Link-->

I don't see a diverter, can you post pictures of the diverter?

I did not see a diverter on the suction side. Can you post a picture of that.

NEVER mix pool chemicals.

Any contaminates ultimately reach groundwater somewhere. Be good stewards...Better to have it go through the municipal sewage system and be handled properly. Please use the sanitary system. (septic aside).

Use your pen for every day. We recommend doing acid additions based on the comparator.

With a TA of 60-80, your pH should be pretty stable between 7.8-8.0...which is just fine. Don't lower pH below 7.8, and don't lower it until you get above 8 (purple hues). You will be just fine. https://www.troublefreepool.com/wiki/index.php?title=PH_TA_Relationship...

You have the space. You will have to remove the valve on the DE filter too, there is no Backwash to a cartridge filter. What is wrong with your DE filter?

See section on "inspect cell" here: https://www.troublefreepool.com/wiki/index.php?title=Pentair_Intellichlor_ICXX_SWG#CELL_LED_is_blinking_or_IntelliChlor_1:_Clean_.26_Inspect_Cell_Message To clean, see cleaning here...

Bubbles in the return is likely your SWG. Turn the SWG off and see if the bubbles go away. Yes, air in the pump baket can be normal. See "Air in the pump basket" here: https://www.troublefreepool.com/wiki/index.php?title=Pump_Basics

Cartridge is a lot less hassle than DE. Whatever you do, go big. Pentair Clean & Clear plus 520sqft or Waterway 525 would be good for your size pool, if it will fit on your pad. If you do go cartridge, put a 3 way diverter between the pump and the filter...gives you the ability to pump to...