Hi. I appreciate the information you provide. I am storing water for long term use. I keep the water in a 200 gallon container and added one bottle of water preserver concentrate, that is good to treat 165 gallons. Should I buy another bottle of water preserver and only use a small amount to cover the remaining 35 gallons or is it sufficient to use only the one bottle. I plan on 4 to 5 year storage of the 200 gallons. Thanks. Wanna kill these ads? We can help!