Hi. I am trying to get things up and running for the summer (like so many others). I have a 17,000 gal inground vinyl lined pool, Jandy60 DE filter, 2 return jets, main drain, and one skimmer and Hayward super pump. Here's my issue: Upon taking off the mesh cover found swamp green pool. Began the process of cleaning up by using the leaf net basket to get as much debris that I could off the bottom (hard to see with such a soupy green mess). Got equipment up and running. Started the DE filter and ran for a day. Pressure was not rising which I thought was odd. Air is coming into the pool from returns. Backwashed the filter. Then decided to wash the grids because of the ton of algae present. Noticed that the DE was only coating about the top 1/4 of the grids. Thought it strange.

Lubed all the orings to try and prevent the air.
Ran yesterday for another 8 hours and pressure went up 5 in that time frame. Still air coming through returns. Turned it off for night.
Trying to decide what is my next step.
Backwash again? Shock? Call a professional and wait for 2 weeks to have them come out?
Appreciate any help.