Mustard algae and sand filters
I've been seeing that the mustard allergy and other types of algae are too fine for sand filters and to pass right through. Which is the problem.
**How often should I be changing the sand in my Hayward filter?** It's a '27 ft above ground, 14.6k gall. Filter is probably a good 10-15 years old. Likey never been changed.
To deal with the algae, I have been shocking once a week with two pounds of Cal hypo the next day I either use a hose siphon or vacuum to waste and pick up all the little brown pools of algae on the floor. Is this the way?