1981 15,500 gal fiberglass in ground (11x32 8ft deep 3.5 ft shallow) with a sand filter.
Location: HOT Arizona Desert
water is crystal clear (I can even see some small stains on deep end floor standing outside shallow end)

Alkalinity 100
cya 30
Total Hardness >1000 test I have only goes up to 1000 (estimated calcium 666)

Don't have a borate tester but I've added 12 boxes of 76oz 20 mule team (as per pool calculator) and acid to drop ph back down to 7.8

My problem : I'm adding a 1.42 gal of 6% liquid chlorine DAILY.

I've been pouring it shallow end in front of return at dusk roughly 7-8pm.
testing before bed 11pm I get 5 ppm (or maybe higher since oto test only shows up to 5)
Morning test 7-8am still at 5 ppm
afternoon testing 2-3 ppm (unless kids have friends over then even lower and I add more bleach to keep from running out of FC)
evening test 7-8pm back down to .5 or less
and I start the cycle all over.

I'm going thru 35-40 bottles of 1.42 gal 6% bleach a month IDK but sure seems like a awful lot ?

I thought 30 cya was ideal should I raise this to ____?