DannyD. wrote, on Tue, 24 Jun 2014 20:32:18 +0000:

a) liquid chlorine:
$cost/gallon x 1gallon/9.7pounds x 1/10.8% by wt available chlorine

b) liquid bleach:
$cost/gallon x 1gallon/9.0pounds x 1/5.7% by wt available chlorine

c) solids:
$cost/pound x 1/??% by wt available chlorine, as listed on the container

I have used all three types of chlorine:
https://c1.staticflickr.com/3/2908/1...5922732f_b.jpg

Assuming the HASA liquid chlorine averaged $3.59/gallon after all the
value-pack coupon and buy-11-get-one-free complicating shenanigans:

The equation for liquid chlorine is:
$cost/gallon x 1gallon/9.7pounds x 1/10.8% by wt available chlorine

So that's:
$3.59/gallon x 1gallon/9.7pounds x 100/10.8 = $3.43/pound of available Cl

By way of liquid chlorine local (Silicon Valley) comparison:
Home Depot = $6.86/2 gallons * 1gal/9.7 pounds * 100pounds/10.8 pounds = $3.27/pound of available Cl
Lowes = $6.90/2 gallons * 1gal/9.7 pounds * 100pounds/10.8 pounds = $3.29/pound of available Cl
Leslie = $10.49/2 gallons * 1gal/9.7 pounds * 100pounds/10.8 pounds = $5.01/pound of available Cl

Comparing the Dichlor, we get:
Leslies = $122/40 pounds * 100/55 pounds = $5.55/pound of available Cl
Lowes = $70/22.5 pounds * 100/56 pounds = $5.56/pound of available Cl
Home Depot = $80/22.5 pounds * 100/56 pounds = $6.35/pound of available Cl
Costco = $55/24 pounds * 100/36 = $6.37/pound of available Cl

For Trichlor, we get:
Home Depot = $75/37.5 pounds * 100/90 pounds = $2.22/pound of available Cl
Costco = 84.79/40 pounds * 100/84.65 pounds = $2.50/pound of available Cl
Lowes $75/35 pounds * 100/85 pounds = $2.52/pound of available Cl[/b]
Leslies = $80/35 pounds * 100/90 pounds = $2.54/pound of available Cl

For Calcium hypochlorite, we get:
Leslies = $107.19/25 pounds * 100/73 pounds = $5.87/pound of available Cl

So, the best price for available chlorine (excluding the fact it raises the
CYA), seems to be the Home Depot Trichlor, or (if you don't want to raise
CYA), the Home Depot liquid chlorine (assuming it's fresh).