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test strips that came with the pool last year

hi the test results are ph 7.6mg/l chlorine 8mg/l alkalinity 80 mg/l did shock the pool a few hours ago though

i have a 15ft above ground pool and this year i have drained it twice as the bottom of the pool keeps going dirty and when i scrub it the water turns greenish i am using 20g multi tablets and also chlorine, all levels are as they should be when i test water. i was told to shock the pool every...