Switching to BBB. What do I do with these numbers?

[duraleigh]

Wayne,

The short answer is, if you are still consuming Cl, you need to add large amounts of Cl until that stops.

Chlorine is consumed by two things, the Sun and organics in the water. You are losing little to the Sun (but some) so the majority of your Cl is used up killing the "bugs".

Try this as a regimen:
At dusk, test your water for Cl and add enough to get you to 25ppm . If your Cl is ZERO when you test, that's 8+ gallons of bleach....not three jugs.
(sounds like you are in desperate need of a good test kit....buy Ben's)
Then test your water again the next AM before the Sun hits it hard. Whatever the difference is between the two tests is how much Cl you've lost killing stuff in your pool....that's good.

You need to maintain this regimen each day until your pools uses virtually no Cl overnite. That'll indicate all the bugs are outa' there and you will begin consuming far less Cl. (it sounds like you're pretty close to that point)

Once you stop consuming Cl overnite, as I said earlier, let your Cl drift down naturally to about 8ppm and then add back enough to get it up to around 15. Maintain between those 2 levels for the rest of the Summer. Please post back with questions. It is essential you understand this process in order to maintain a sparkling pool.

PS - you don't need "shock". You are already shocking your pool when you raise Cl levels to 25ppm.