Edarling

It is not an extravagent expense to change the valve to the multiport that will allow you to recirculate. I think maybe $ 100. Check it out.

Secondly, some well written authors and myself, think that the Hayward DE filters with their bumping are a bad joke. The prinicpal is that you start with a clean filter, add DE and then run the system until the pressure builds up, then bump it. The pressure went up because the filter got coated with debris. When you bump it, you knock all the DE and debris off the membrane into a sloppy slurring the bottom of the tank. Then you re-start the system and the whole mess re-coats the membrane. All the debris, organic and otherwise is still in there !! The organic stuff is still going to consume your chlorine, inside the filter.

If you're having problems, forget the bumping. Backwash it and get rid of the contaminants. You'll clean the pool up much faster.

But, to really kill of algae you need lots of chlorine, in other posts above, but you really need to keep the water circulating to keep the algae exposed to the chlorine. Brushing helps too. So the valve with the bypass/recirulate setting will really help till the problem is cleaned up.