Ok, that almost completely rules out metals in your pool water. It also means you can't trust your pool store tests much at all.
If you access to a Sams Club nearby, and it fits your budget, they have 50lb buckets of dichlor for $105 . . . which is a VERY good price in most parts of the country. Dichlor will add BOTH chlorine and stabilizer.
Also, you HAVE to get a cheap OTO/phenol red kit (yellow chlorine drops) -- you need that regardless of the K2006, since it will keep you from using up the K2006 too soon. Once you have that, use it to check your chlorine.
Add 4 gallons of bleach every evening - not daytime - till your algae is gone. Then cut back to 2 gallons per day. (If you can get the dichlor now, it will be cheaper over the long run, and make things easier.) Dichlor is also available from Amazon for about $3 - $4/lb:
Kem-Tek Dichlor @ Amazon 12lb => 49 + 0
Kem-Tek Dichlor @ Amazon 22.5lb $75 + 0
Bookmarks