Whether or not it ' s economical depends on volume . Well . partly . There are fairly inexpensive ways to treat very low flows down to discharge levels as long as there ' s no process chemical contamination . We sell a couple of them . At a certain point , nobody really cares if a little art studio is cleaning the paintbrushes into the sink . If a dye factory is turning the town wastewater various primary colors throughout the week , eventually somebody from the water department is going to drop by to discuss your new rate plan . <| sep |> 25 % Off and free shipping . Portion of proceeds help save the whales . www . AquaBelu . com <| sep |> I always thought it was weird that Batman gets attacked by selling in his helicopter so often that he actually has a dedicated area for those repellents .