I believe that filter is Hayward S180T with a top mount Multiport valve. If so: you could vacuum to waste, bypassing the filter and send the junk from the bottom out the backwash line.
You probably also have some trouble with your filter, perhaps the sand has been washed away. That 18" filter isn't very big and may be losing sand withevery backwash.
Is it convenient to open the filter to inspect the sand bed? The sand should be withing 6" of the top of the filter tank.
Another possibility is losing sand into the pool because of cracked lateralls or multiport valve trouble. Is there sand in the pool?
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