What causes TA to go down over time? And more Trichlor help please!

[houston_tink]

My TA was 80 in February, 66 at the end of March and now 50 today....I bought baking soda to add, but what causes TA to go down like that?

Trying to figure out how to chlorinate my pool with Trichlor for 9 day vacation. I have 5 pucks in the floater and my CYA is 40 and I am having to add a gallon of bleach daily because my FC keeps dropping to 2.5. Do I just need like 5 more pucks??

 

[Mr Bruce]

How are you testing your water? What is the TA of your fill water?

 

[houston_tink]

How are you testing your water? What is the TA of your fill water?

Testing With the TF100 test kit.

What do you mean TA of fill water? I take my sample from where my return jet into pool is

 

[Richard320]

TA goes down with the addition of acid. It can come via acid you add to lower pH or via trichlor pucks, which are very acidic.

Use the search box for Vacation and you'll see many threads with many tips for dealing with the pool while you're gone.

 

[triptyx]

Testing With the TF100 test kit.

What do you mean TA of fill water? I take my sample from where my return jet into pool is

Run a TA test from your kit on a sample of water from your water fill source (the hose, autofill, what have you). This will give you an idea of what the TA of the water you're putting into the pool is, and a better idea of the effect on your chems of adding fresh water to your pool.