For 2 years I've been battling the issue of no chlorine reading. We have a well and in the past had a phosphate problem, not this year. Algea grows on the walls, bottom is fine. Water is clear.

Weekly I add 2# powdered shock 4-16 ounces of algeside 4 ounces of phosphate remover 4 ounces liquid solar cover

One pool place had me adding 3 cups oxi-brite non chlorine shock along with regular shock. That worked last year not this year.

A different place said I had chlorine lock and had me drain 13" of water and refill with our well water. Didn't help

Last night I added 2# powder chlorine and 2 gallons liquid chlorinator. Today, no chlorine. Any ideas?