Just wanted to confirm that the product is effective in a stainless steel holding tank. (If the answer is yes, we can then proceed with your advise re holding tank odor) We have a new tank, new appropriate hoses, and an increasing build-up of gas in the holding tank. (We are using K.O.) The tank is in the v-berth with a 1" air vent on the starboard hull. A new thru hull discharge was installed above the tank. Thanks, Peggy.