Need help with Chlorine please (new pool)

[roll tide]

My VINYL LINER pool is about 2 months old now. The last few days I haven't been getting a chlorine reading with my kit. I took it to the store today and here are my results:

Temp: 80 F
Free Chlorine: 0.3 ppm
Total Chlorine: 0.3 ppm
Combined Chlorine: 0.0 ppm
pH: 8.1
Hardness: 0 ppm
Alkalinity (w/ stabilizer
correction) - - - - - > 131 ppm
Cyanuric Acid: 30 ppm

Pool size is 18 x 36 ft. 24000 gallons or so.

Polaris AutoClear system. Polaris says, according to system readings I gave them, the system is producing chlorine. My salt test strips say I have about 3500 ppm of salt so everything looks normal to me except for slightly high pH. I run my pump from 8 a.m. to 10 p.m. daily and the AutoClear for 8 hours. What about the CYA? It's on the low end. Do I need to raise it and how do you do that? I can see the bottom of the pool but the bottom is a little slippery and I'd like it to be a little clearer.

My pool builder says it's the hardness?? But he admits he's still learning these systems. Any advice??? Thanks.