Test chlorine and ph every day or at least every other day. Every couple of weeks is probably ok for alk and cal. CYA a couple of times a season is plenty. CYA of 30 is fine.
Good readings:
PH 7.4-7.6 (but anywhere 7.2-7.8 is acceptable)
Alk 80-125 (although if it is a little higher, no problem)
FC 3-6 (for a cya reading of 30)
CC zero (FC + CC = TC)
Calcium hardness 200-400 (but not needed in vinyl pools)
CYA 30-50
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