What should it cost w/chemicals?

[JohnT]

I have a 20,000 gallon pool with a heat pump and a clormatic salt chlorinator. My pool guy charged $320 to remove the cover and open the pool plus the following charges for chemicals (Baltimore, MD.) Do the prices and amounts of chemicals look reasonable? Total price $521
15 lbs. calcium hardness increaser $22.90
15 lbs. alkalinity increaser $25.10
DE - 25 lbs. $30.85
240 lbs. salt - $50.70
20 lb. cyanuric acid $40.00
4 gallon liquid chlorine $22.00

Calcium Hardness increaser runs about $15 for 50 lbs as ice melter.
Alkalinity increaser is baking soda: $5.42 for 12lb at Sam's Club.
Cyanuric Acid- 25 pounds???? I hope they didn't put it all in the pool.
Liquid Chlorine equivalent of 4 gallons as 8 gallons of ultra bleach from Walmart: $10.24
DE $20 for 20 lbs anywhere. Even cheaper at Walmart.
Salt $4.49 for 40lb at Lowes