My first acid addition: Sanity check

[mgtfp]

Good point. The main reason I did the acid demand test was because I was reading higher than 8.0 pH. Is there a better way to do this?

Nothing cheap and easy. Electronic pH-meters are an option, but they need some maintenance and regular calibration to be reliable.

Apart from that only the iterative way that Poolstored mentioned, or the acid demand method that you already used.

A side bonus of reducing the pH-ceiling by maintaining lower TA is, that because pH won't really rise much beyond 8, and because the rise is quite slow by then, you can usually assume that pH can't really be much beyond 8 once the colour maxes out, but the previous reading just a a few days earlier was still below max-colour.

 

[mgtfp]

oooooh, oooooh, I got this. Stay out of the pool store and you will avoid being pool stored.

There can only be one PoolStored