As I mentioned above, until you have a measurable cya reading, you will lose chlorine fast in the pool. Adding 1 TBSP dichlor will raise the cl level in your pool by 1ppm. That isn't much and then without much cya yet, the cl will be gone quickly. I think for the first week or so you should probably be adding dichlor probably 3 times a day. Or maybe add more than 1 TBSP at a time. Maybe try adding 4 TBSP in the morning and see if that amount will allow you to keep from dropping below 1ppm by evening. Either way, the bottom line is you are not putting enough chlorine in the pool each day and that is why your FC seems to be at 0. You are risking an algae bloom by having this happen.
In regards to pH, dichlor is pretty acidic so it will drop the pH. You'll just need to test it several times per day and be ready to add Borax any time it drops below 7.2.
Hope this helps.
EDIT: One other thing --- 1 lb. dichlor should take your cya up to about 40ppm, so by the time the full pound has been added, you'll need to be keeping your FC between 3-6 all the time to keep algae at bay. For the first week or so, make sure the FC doesn't drop below 1. But, as you use the dichlor, gradually increase your minimum FC level. Maybe next week don't let it drop below 2 and then as you get closer to using the whole pound, don't let it drop below 3ppm.
Bookmarks