[MileHi]

Buy clorox bleach.

No. Buy powdered pool chlorine. Teaspoon or so per gallon and it doesn't off gas and corrode stuff (and become ineffective)while you store it.

[tiki]

One package of pool shock will do thousands of gallons. Now is the time to buy it on clearance.

[Stand Watch Listen]

Calcium Hypochlorite (pool shock) is sold in a solid granular form and has a 10 year shelf life when stored in a cool, dark place. This will easily meet your long-term storage needs.

The other benefit is the amount of available chlorine. The concentration of chlorine is much higher with Calcium Hypochlorite. For example, a small 1-pound bag of calcium hypochlorite can disinfect up to 10,000 gallons of drinking water. That’s around 5 gallons/day for one person for 5 1/2 years! Not bad for only 1 lb of granules.