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Run the pool filter continuously until the water is clear making sure to backwash the filter as often as necessary.
If it has a strong backwash it will drag large amounts of material down the beach.
This method of passing the line lessens the danger of the heavy backwash carrying the towline into the screws of either or both boats.
Recommendation 31 Attention needs to be given to the effective design of systems for separating supernatant water from sludge and backwash solids.