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How do you get all the algea out of vacume hose? Not much, few spots here there as far as I can see.

Low alkalinity & high ph. Alkalinity bout 50 & ph 8.3 Keep adding baking soda-then ph minus. Water tested at 2 major chains. I buy & add all chemicals & right back where I started 24hrs later. 27ft 4.6 ft vinyl, hayward missile cartridge. Been at it 6wks, vacumed out 6in & refilled last week. No...