How often to test?

Once a season. But that is just because I have a vinyl liner and I only test my CH once when I open my pool so technically I never do a full test again the rest of the season.

I do the OTO and pH test at least every other day (usually daily), I use the FAS/DPD and TA test weekly and test my CYA about once a month give or take a couple weeks.
 
For me, I test FC (FAS-DPD) and pH everyday because I not only want to stay at/above my FC target, but also because I'm experimenting with my CSI to reduce some previous scale I received in my pre-TFP days. :) I'm a bit lazy with TA and CH, but try to do them about once a week or so, and I don't normally worry about CYA unless I had a lot of water exchange or I see my FC dropping too fast.
 
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