I have your book, and on page 49 it gives a six step procedure for fresh water maintenance. My boat is a Catalina 320, the manual that came with it has the identical six step procedure except for step number one. Your step one says to mix 1/2 cup Clorox or Purex with one gallon of water for each five gallons of capacity of the tank. The Catalina manual says to mix 1/4 cup of same to one gallon of water for each 15 gallons of capacity. Bottom line is your formula is six times stronger than Catalina's. Both state that they comply with section 10.8 in the A-1 192 code...etc, etc. My thinking is that your formula is very strong and getting the taste/odor out after the 'cleaning' may be a problem. Is one a typo/incorrect?