Small correction
Bilge water is not gray water. Gray water, by definition, is limited to "galley, bath andd shower water." Bilge water is bilge water.Btw, the oil pads will not work if there's any detergent or bilge cleaner in the mix. Bilge cleaners and detergents emulsify oil, gas, diesel etc...it breaks up the molecules so they mix with water. Once that happens, the oil pads can no longer absorb the oil...they repel it along with th rest of the water.