Wheeeehhhhh what a summer. First got diagnosed with mustard algae (think they were wrong). Had super cloudy water then, and replaced sand in filter...that cleaned up the water, but had brown stains on side and bottom of pool. Used your ascorbic trick....YOU GUYS ARE AWESOME WITH ADVISE...just joined last week. now the stains are gone....so i added two bottles of metal out (23000 gal pool) after lowering ph and chlorine. Now I am ready to add chlorine and borax to raise ph and cl levels...the alkalinity is medium to high. Sound like a good plan????? Is there a standard...for bleach addition when I am used to the 1 lb bags of shock.....for example...maybe 1 liter of bleach has same effect of 1 one lb. bag of shock?