Can I just use a combination of liquid chlorine and trichlor???

[mwemaxxowner]

It disappears pretty fast in water with 0 FC and low dissolved oxygen. I suspect those of us who routinely see CYA disappear in the winter months have a combination of 0 FC and short pump run times. It's not something that can be done with water temperatures over 60°F or so. The algae would be insane, especially after the CYA was converted to ammonia.

This is basically irrelevant to OP's question unless an entire season of using trichlor for 50% of his chlorine needs will keep CYA below sane limits.

That's interesting!

So, does that mean I could drop my cya a bit over winter without an exchange?

 

[Yev]

That's interesting!

So, does that mean I could drop my cya a bit over winter without an exchange?

In Cincinnati, my CYA drops from about 45-50 when I close normally to <30. Not sure why, could be CYA breakdown, could be the large amount of water that gets exchanged from rain and snow melt and gets pumped out of the pool during the winter.

 

[Saturn94]

I am colorblind as well. The only test that I cannot perform on my own is the calcium hardness test. For my eyes it's already blue from the start Everything else is no problem though. Don't be scared off unless you know for certain that this particular test doesn't work for you. The CYA and chlorine test will work even for someone with black and white vision.

Same here!