I agree with Bricklayer. I turn them inside out and wash them with hot water with the sprayer. ( I do have a garden hose sprayer on my faucet) After the season I do the same and then put orlon and prefilters in boiling water for 5 minutes or so. I then change the water and repeat. I then air dry on the clothesline on a sunny, windy day or 2. Make sure they are completly dry and then store in sealed plastic bags. Been working for me for years. I do start the season with new prefilters for syrup and I use the used prefilters for sap filtering. If you ever took the agitaor out of your washing machine and saw the scum built up under it you certainly would not wash your filters in it.As far as washing with chlorine in the water I believe it will disipate before you will get a taste. (My opinion).