How to calculate cost per effective pool chlorine liquid vs powder

On 4/30/2012 12:43 PM, Dakar F. wrote:

Because they aren't shocking with the chlorine, they're shocking with potassium monopersulfate.
If anything the real issue is that they should be selling 100% potassium monopersulfate (which is available) and be letting the buyer shock with potassium monopersulfate and chlorinate with chlorine.
They've created a product that does two things 1) chlorinate and 2) shock, and they can charge a premium price for it.
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On Tue, 01 May 2012 09:13:00 -0700, sms88 wrote:

As I said to trader4, this makes sense.
But ... there is another datapoint.
Datapoint 1: At Costco/Walmart/Lowes, the AquaChem 4-in-1 shock doesn't state the available chlorine. Rationale: It has been proposed that's because it also contains sanitizers that have no component of chlorine - so listing the number would under represent the sanitizing capability.
This may be true ... but there is that pesky second datapoint.
Datapoint 2: At Home Depot, the PoolTime 1-in-1 shock also doesn't state the available chlorine! And, in this case, there are no complications with any other non-inert ingredient.
Datapoint 3: AquaChem and PoolTime are the same company!
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Here is the summary (without taking into account available chlorine)
1.    Household bleach Costco = \$9/182 fl oz x 3 bottles, nominal 6% = \$2.11/gallon Safeway = \$3.89/1.42 gallons, nominal 6% = \$2.74/gallon
2. Pool bleach Hasa = \$21.44/8 gallons = \$2.68/gallon Hasa = \$11.72/case (where a case is 4 gallons) minimum 36 cases delivered , 12% = \$2.93/gallon Home Depot = \$6.86/2 gallons, nominal 12% = \$3.43/gallon Lowes = \$6.90/2 gallons, nominal 12% = \$3.45/gallon Hasa = \$18.40/4 gallons = \$4.60/gallon Leslie = \$10.49/2 gallons, nominal 12% = \$5.25/gallon
3. Dichlor Costco = \$55/24 one-pound packets, see note A = \$2.29/pound Leslies = \$122/40 pounds, 55% available Cl = \$3.05/pound Lowes = \$70/22.5 pounds, 99% dichlor, 56% available Cl = \$3.11/pound Home Depot = \$80/22.5 pounds, 99% dichlor, 56% available Cl, See Note B 3.56/pound
4. Trichlor Home Depot = \$75/37.5 pounds, 99% trichlor, 90% available Cl = \$2.00/pound Costco = \$84.79/40 pounds, 94.05% trichlor, 84.65% available Cl \$2.12/pound Lowes \$75/35 pounds, 95% trichlor, 85% available Cl = \$2.14/pound Leslies = \$80/35 pounds, 90% available Cl = \$2.29/pound
5. Calcium hypochlorite Leslies = \$107.19/25 pounds, 73% available Cl = \$4.29/pound
And here's the summary taking into account available chlorine! 1. Household bleach Costco = \$9/546oz * 128oz/gal * 1gal/9.0pounds * 100pounds/5.7pounds \$4.11/pound of available Cl Safeway = \$3.89/1.42 gallons * 1gal/9.0pounds * 100pounds/5.7pounds \$5.34/pound of available Cl
2. Pool bleach Hasa \$21.44/8 gallons x 1 gallon/9.7 pounds x 100/10.8 = \$2.56/pound of available chlorine (see note C) Hasa = \$11.72/case * 1 case/4 g * 1gal/9.7 pounds * 100pounds/10.8 pounds \$2.80/pound of available Cl
2. 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 Hasa = \$18.40/4 gallons x 1 gallon/9.7 pounds x 100/10.8 = \$4.39/pound of available chlorine (see note C) Leslie = \$10.49/2 gallons * 1gal/9.7 pounds * 100pounds/10.8 pounds \$5.01/pound of available Cl
3. Dichlor 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
4. Trichlor 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
5. Calcium hypochlorite Leslies = \$107.19/25 pounds * 100/73 pounds = \$5.87/pound of available Cl Note: While I was there, I researched the comparison prices of the following:
6. Muriatic Acid: Leslies = \$14/2 gallons of 29% HCl = \$3.50/gallon of 14.5% equivalent Lowes = \$10/2 gallons of 14.5% HCl = \$5.00/gallon of 14.5% equivalent Home Depot = \$11/2 gallons of 14.5% HCl = \$5.50/gallon of 14.5% equivalent
7. Cyanuric acid: Home Depot = \$20/5 pounds = \$4/pound Leslies = \$24/4 pounds = \$6/pound
8. Soda ash: Leslies = \$66/50 pounds = \$1.32/pound Home Depot = \$8/6 pounds = \$1.33/pound
9. Calcium Chloride: Leslies Hardness Plus (unlabeled but store said it's Calcium Chloride) \$45/25 pounds = \$1.80/pound Home Depot = \$11/5 pounds = \$2.20 pound