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Instructions
STEP 1: Determine the ppm change (decrease):
Current ppm - Desired ppm = ppm change
Example: Current ppm (20) - Desired ppm (1.0) = ppm change (19)
STEP 2: Determine chemical to use to lower the chlorine, plug in ppm change and use the following formula:
1. Sodium Sulfite (0.2) x (ppm change) x (pool volume / 10,000) = pounds
2.
Sodium Thiosulfate (solid)
(0.0625) x (ppm change) x (pool volume / 10,000) = pounds
3. Sodium thiosulfate (liquid)
(1) x (ppm change) x (pool volume / 10,000) = ounces
Example:
200,000 gallon pool has 20 ppm Chlorine. Sodium thiosulfate will be used to decrease the chlorine level to 1.0
Current ppm (20) - Desired ppm (1.0) = 19 ppm change
(0.0625) x (19) x (200,000 / 10,000) = 23.75 pounds sodium thiosulfate
note: " / " means divided by, x means
multiply
How To Shock a Pool
The "smell of chlorine" in a pool is actually the smell of chloramines,
the chemical compounds formed when chlorine combines with sweat, oils,
urine and other contaminants in the water. Chloramines are not effective
in disinfecting the water and cause eye and skin irritation.
Breakpoint Superchlorination or "Pool Shocking" is required to
combat the loss of effective chlorine in the water. Breakpoint
Superchlorination is required (on average) every 2-3 weeks for indoor
pools and every 7-10 days for outdoor pools. Heavy bather loads
will increase the need for Breakpoint Superchlorination.
Instructions for
Breakpoint Superchlorination of your water are available to
read online, or you can
download and print a copy of the instructions in
Adobe PDF format.
Public Water Facility Chemical Log Sheets
Public water facilities are required by 410 IAC-6-2 to
keep a record of the pool water chemistry.
Log Sheets for recording this information are available for download
in Adobe PDF format.
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