Green water shooting into pool

[greytdogs]

I have a DE filter and just got my pool water looking clear, but the past few days when I start my filter in the morning
green water shoots out from all the jets for about a minute, but then turns clear . I have been taking the filter apart to clean it every 2 days during my initial clean up, because backwashing seems to waste too much water and chemicals for as frequently as I have to do it. After I hose down and clean the filter I reassemble and then turn the backwash on for a minute or two to flush anything that may be remaining in the lines. I seem to think my problem started when I did some heavy hand vacuuming ( after which I cleaned the filter throughly).

I've searched the forum but can't really find an answer to this problem of the jets initially shooting out green water- could it be a valve problem somewhere or another problem?

Thanks for any help you can offer!