1-pound of gas chlorine = 1 part per million (ppm) in a 120,000 gallon pool. *Average cost $ .28 lb

1-gallon sodium hypochlorite (bleach) = 1 part per million (ppm) in a 120,000 gallon pool. *Average cost $ .75 per gallon.

1 1/2 pounds calcium hypochlorite (tablets) = 1 part per million (ppm) in a 120,000 gallon pool. *Average cost $1.60 per lb.

The City of X used sodium hypochlorite (bleach) to disinfect their 3 swimming pools last year. The total number of gallons used for the year was 10,000. The cost of the bleach was $0.75 per gallon, so the cost to disinfect City X's pools last year was 10,000 gallons X $0.75 which = $7,500.00

This year City X is thinking of changing to calcium hypochlorite (tablets) for disinfection. To do this it will take 1 1/2 lbs of calcium hypochlorite (tablets) per gallon of bleach it took last year.

That is 1 1/2 lbs x 10,000 gals which equals 15,000 lbs

The price of the calcium hypochlorite (tablets) was $80.00 per 50 lbs bucket, which equals $1.60 per lb.

So $1.60 x 15,000 lbs = $24,000.00

That means the cost increase to change from bleach to tablets would be $24,000.00 minus the $7,500.00 it took last year which = $16,500.00

That is $16,500.00 plus the cost of the new feeders!

The sales guy said it had something to do with chemistry?