Last year our pool was installed, so this is our first time opening our pool. We opened it this past weekend. We installed a new vision cartridge and chlorine canister for the nature 2 system. After filling it a third of the way with new water we shocked the pool with a dose of what should have been 10 ppm. We then tested it with test strips no chlorine was found. We then shocked it again with another round of 10 ppm. It still showed no chlorine. We then had our water tested at a pool store. These are the results: CYA 0, Tot. Chlorine 5.8, Free Chlorine 0.4, pH 7.7, Alkalinity 200, Hardness 560.
We were told to add 3 lbs stabilizer which we did overnight. Today we added another 1/2 gallon of liquid shock along with 1 lb granular shock. We tested the pool again and still show no chlorine.
We have been running the filter 24 hours/day on low since Monday.
Any help on what might be wrong would be really appreciated.