How to give me green water with a towel

Does the subject want to ask "how to treat green water with towels"? Put the towel on the filter. The reason for green water is actually that there are more algae flowing in the water. Chlorella is a spherical unicellular algae, which is common in green water. Put a towel on the top of the filter, spread it on the filter cotton, lift the edge, and turn on the water pump to filter, so that Chlorella can be intercepted at the maximum flow rate to achieve the purpose of controlling green water.