You are in the right place. I was in your position several years ago. After wasting money I learned that a drain and refill was the only way. Manage your cya level yourself and use chlorinating liquid. The algaecides are not necessary. Good.luck.
Winco, Arlington TX, now selling "Top Job" brand bleach. 8.25% 121 oz. for 2.00. They no longer carry their unscented store brand. At least not since this spring.
WinCo in Arlington dropped price to $1.75. I bought some yesterday. Looked like new style jug.No printed code. MA8208 in raised letters on bottom of jug.