Algae and cloudiness

[404Pool]

After some recent heavy use and rain, my pool became cloudy and had algae growth. I ran tests with TF pro kit. pH was 8.2 so I brought it down. Algae seems to have decreased but still some there and cloudiness. Just did a full series of tests and got the following numbers.
pH - 7.5
FC - 7ppm
CC - 1ppm
CH - 275
TA - 90
CYA - 50
Salt - 3200ppm

Any recommendations on what I need to do?
Pool is 35000 gallon, SWG, sand filter. Thanks!

 

[mknauss]

Welcome to the forum!
You need to follow the SLAM Process. To do that, you need a proper test kit. I suggest the TF-100 or Taylor K2006C. A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.

While you are waiting on your test kit, add 5 ppm FC worth of liquid chlorine / plain bleach to your pool each evening with the pump running. This will replenish the FC lost each day to the sun and also inhibit any algae in the water from growing further.
I suggest you read through Pool Care Basics - Trouble Free Pool and even look at a few of our videos TFP-TV - Trouble Free Pool

 

[404Pool]

I got the TF Pro kit and used that for my tests. Is that not a good kit?

 

[dfwnoob]

You have the correct kit already!

Agreed that you will need to SLAM following the guide linked above. You need to finally finish off what's left of the algae in there.

 

[mknauss]

I got the TF Pro kit and used that for my tests. Is that not a good kit?

You bet. Your original post did not say that.

 

[404Pool]

You bet. Your original post did not say that.

Okay thanks. I fat fingered the post button and had to go back and edit to finish the full post.

Will do a SLAM. It is correct that I can just use liquid bleach for SLAM? Thanks!

 

[mknauss]

It is correct that I can just use liquid bleach for SLAM?

Yes. That is the preferred item for chlorinating for a SLAM

 

[dfwnoob]

Yep, bleach is fine it's all the same stuff, just make sure it doesn't have any added nonsense (no anti-splash, no fragrances, no chloromax, etc). It'll take less jug-lugging if you locate some liquid pool chlorine or "liquid shock" as pool stores tend to call it since most household bleach is only around 6% vs 10-12.5% for liquid chlorine.

 

[404Pool]

Okay great. I was at HD recently and they have plenty of liquid shock.

 

[404Pool]

Doing SLAM and the pH spiked up to 8.2. Is this odd? I only added liquid shock 10% and brought the FC to 20 based on the chart. Do I need to continually monitor and bring pH down during the SLAM as well?

 

[dfwnoob]

The pH reagent gets weird above 10ppm FC and gives false readings - it's why the SLAM directions say to get the pH down first before adding chlorine. Ignore the pH reading for as long as your FC is above 10.

I actually just came across a really great post yesterday explaining what happens with the phenol red when the chlorine level is high but of course I can't find it now.

 

[404Pool]

Okay great. Thanks for that. I took care of the pH before the SLAM so should be good. I figured with the huge jump out had to have something to do with the SLAM.