Chemicals after refill

shadair

New member
Jul 30, 2020
3
Houston, TX
We have owned our pool for 7 years now and never really knew what we were doing. So glad I recently found this site. We are replacing the water for the second time this season due to high Cya and algea growth😫. We want to get it right this time. After refilling the pool, what do we add right away? I bought a good testing kit but what other chemicals should I invest in?
Thank you!!!!!!
 

Mike1162

Silver Supporter
Jun 13, 2015
720
N Tonawanda, NY
Welcome to TFP!

Tell us what test kit you purchased & post a full set of results from the tests. You're going to want to switch to liquid chlorine because it doesn't add CYA to the water.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
23,924
San Dimas, CA (LA County)
Welcome! :wave:

You should know from past experience if your water is high or low pH. If you've been adding acid, you'll need it again. If you've been raising pH, you might be doing it again.... or it could just be the acidity from a steady diet of trichlor pucks that drove the pH down.

You will have no CYA in tap water, so that's a safe thing to buy in advance.
You will have to SLAM to kill any residual algae, so liquid chlorine/bleach will be needed. If you find a good deal, stock up on 8 or 10 gallons.

So stabilizer, liquid chlorine, and possibly something to adjust pH, which will be determined by testing. Not knowing if your pool is plaster or not, nor knowing the CH rest results, there's no way to know if you will need to address the Calcium Hardness or not.

Ultimately, it all depends on test results. And what is your "good testing kit"? If it doesn't have the FAS-DPD chlorine test, it won't work on a SLAM.
 

shadair

New member
Jul 30, 2020
3
Houston, TX
Welcome to TFP!

Tell us what test kit you purchased & post a full set of results from the tests. You're going to want to switch to liquid chlorine because it doesn't add CYA to the water.
Welcome to TFP!

Tell us what test kit you purchased & post a full set of results from the tests. You're going to want to switch to liquid chlorine because it doesn't add CYA to
Welcome to TFP!

Tell us what test kit you purchased & post a full set of results from the tests. You're going to want to switch to liquid chlorine because it doesn't add CYA to the water.
Thank you for your response! We're draining the pool tomorrow. At that point I guess I'll test it. Are there chemicals I can expect to add so I can have on hand? In other words, will the tap water have levels that I will have to lower?
 
Last edited by a moderator:

shadair

New member
Jul 30, 2020
3
Houston, TX
Welcome! :wave:

You should know from past experience if your water is high or low pH. If you've been adding acid, you'll need it again. If you've been raising pH, you might be doing it again.... or it could just be the acidity from a steady diet of trichlor pucks that drove the pH down.

You will have no CYA in tap water, so that's a safe thing to buy in advance.
You will have to SLAM to kill any residual algae, so liquid chlorine/bleach will be needed. If you find a good deal, stock up on 8 or 10 gallons.

So stabilizer, liquid chlorine, and possibly something to adjust pH, which will be determined by testing. Not knowing if your pool is plaster or not, nor knowing the CH rest results, there's no way to know if you will need to address the Calcium Hardness or not.

Ultimately, it all depends on test results. And what is your "good testing kit"? If it doesn't have the FAS-DPD chlorine test, it won't work on a SLAM.
Welcome! :wave:

You should know from past experience if your water is high or low pH. If you've been adding acid, you'll need it again. If you've been raising pH, you might be doing it again.... or it could just be the acidity from a steady diet of trichlor pucks that drove the pH down.

You will have no CYA in tap water, so that's a safe thing to buy in advance.
You will have to SLAM to kill any residual algae, so liquid chlorine/bleach will be needed. If you find a good deal, stock up on 8 or 10 gallons.

So stabilizer, liquid chlorine, and possibly something to adjust pH, which will be determined by testing. Not knowing if your pool is plaster or not, nor knowing the CH rest results, there's no way to know if you will need to address the Calcium Hardness or not.

Ultimately, it all depends on test results. And what is your "good testing kit"? If it doesn't have the FAS-DPD chlorine test, it won't work on a SLAM.
Such valuable information. Thank you so much! I guess I need a new test kit. This one tests Chlorine Residual/bromine.