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View Full Version : How Much Bleach According to the Ben's Best Guide Chart?



StevenHumphrey
08-23-2014, 08:45 PM
My pool is still green but I have hope. I am waiting for the Taylor test kit - K2006 - but in the meantime I tested with a test strip. My pH and alkalinity are within range. The test strip indicates my CYA is between 50-100 ppm. I would like to get my Free Chlorine up to 15 ppm according to the BBG chart. I have 50 bottles of bleach. They are not gallon bottles but 96 fl. oz. I have about 37 gallons of bleach. How many gallons do I need to pour in to raise my FC up to 15 ppm? Do I pour the bleach directly in the skimmer or in the pool? Thank you in advance for any assistance you provide.

Pappy
08-23-2014, 08:49 PM
What is the concentration of the bleach? And the volume of the pool? I pour bleach through the skimmer with the pump running.

StevenHumphrey
08-23-2014, 09:04 PM
I purchase the bleach at Dollar Tree - Home Store Bleach. It does not state on the bottle but I would surmise it is 6% sodium hypochlorite. My pool is 20 x 44 - 30,000 to 35,000 gallons. I have used Clorox Concentrate a couple years ago and my pool started sudzing up. Someone on the forum told me that Clorox Concentrate should not do that but the Dollar Tree is the only place I can find regular bleach.

CarlD
08-23-2014, 09:24 PM
The way you calculate FC added is by the following formula:
(1,000,000/PV)*Conc*Amt= FC

PV= Pool Volume
Conc= Concentration of bleach as a decimal, so 6% is .06, 8.25% is .0825
Amt= Amount of bleach added in gallons--I usually use 1

To convert to odd amounts set Amt to 1, then divide by 128 (ounces), then multiply by the odd number of ounces.

StevenHumphrey
08-24-2014, 10:55 AM
My thanks to Pappy and CarlD. According to the formulas provided by CarlD, I needed 16 bottles of my bleach to raise the FC to above 20. I know I said 15, but I decided to raise it to 20.

In the past hour, I swept the pool. I had my recently repaired Mr. Polaris running during the night, so I did not get that much bloom when I swept the pool.

After sweeping it down, I tested for pH using a drop test kit. The test indicated I was somewhere between 7.2 - 7.5. My FC drop test was 0. I then tested with an hth test strip - it has CYA on the strip - and the pH and FC were the same. The CYA indicated between 50 and 100 ppm.

Next, I poured in 17 bottles of my bleach directly into the skimmers. Now I am going down the road for some errands and I will test the FC when I get back. Hope to hear from someone when I return.

Again, thanks to Pappy and CarlD.