If you're really dumping in 1 quart at a time then you will be having issues. Kalk needs to be added SLOWLY like a drip or a small trickle for a short period of time. Get a ball valve to restrict your topoff and it will fix it. I too have about 65 gallons in my system and my ato adds maybe 1/4 cup of solution at a time by a slow trickle.