Help! Can you tell me what this is?

Swgs produce tiny bubbles all the time, while yours seems a little excessive there are several things that can make this more noticeable

This thread covers alot of the possibilities
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Very common in the spring. When the water warms and chemical balance improves, the bubbles will become less prominent. Essentially, they will get bigger, but fewer.
 
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@theskydiveguy ,
We do things a bit different here…
The main staple is doing your own reliable, repeatable testing.
What is TFPC?
& have a Look over the articles in the link Marty posted.
Also, dry acid isn’t recommended when you have a swg so when you run out you should switch to muriatic acid for ph control
 
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