Jets blowing dirty water when Vacuuming

Just this morning my son was vacuuming, to save water I told him to vac to filter.He came in and said after a couple minutes green stuff coming out of return.
We have a sand filter, could this be filter getting overloaded to quickly. We are now vacuuming to waste and I'll catch some water coming out of return once we're
done vacuuming.
 
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