Need Help with Chlorine Levels

[Watermom]

Good advice from Jan. One other thing I might add is that for the first week or so until your cya dissolves, you might want to test and add bleach morning and evening. After that, you should be able to just test and dose it with bleach in the evenings only.

[stateroaddog]

Sounds great. I got the Bleach (6%) and supplies as you told me. How much bleach do you put it. I looked at the bleach calculator and another chemical calculator that is listed on the site but it only has me adding approximately 134 oz of 6% bleach. to raise teh FC to 3 PPM. That dosent seem like very much bleach to me. Could you advise if that sounds correct or not?

[CarlD]

Sounds great. I got the Bleach (6%) and supplies as you told me. How much bleach do you put it. I looked at the bleach calculator and another chemical calculator that is listed on the site but it only has me adding approximately 134 oz of 6% bleach. to raise teh FC to 3 PPM. That dosent seem like very much bleach to me. Could you advise if that sounds correct or not?

Actually, it's spot-on. You have 21,500 gallons. 1 gallon (128 oz) of 6% will raise 20,000 gallons 3ppm.

Here's the rule of thumb:

One gallon of bleach (whatever its strength is) will raise 10,000 gallons by that strength--In other words: If you add 1 gallon of 5.25% to 10,000 gallons it raises it 5.25ppm. 1 gallon of 6% raises it 6ppm. etc. So....if you add 1 gallon of 6% to 20,000 it's diluted to half-strength--3ppm. You are just over 20,000 gallons at 21,500 gallons. So....you are just over 1 gallon by 1/2 cup.

See how it works? The Rule of Thumb uses the same formula as the Bleach Calculator, but only at the simplest values: 1 gallon. 10,000 gallons. So you adjust up or down from that.

[stateroaddog]

Thanks. That makes me understand it much better..