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Instructions
STEP 1: Determine the free available chlorine (FAC)
in the pool water (ppm). Using the DPD test kit, following the
test kit instructions
STEP 2: Determine the amount to increase the chlorine to (ppm)
STEP 3: Determine the ppm change using the following to
increase:
Desired ppm - Current
ppm (FAC) = ppm change
Example: Desired
ppm (20) - Current ppm or FAC (1.0) = 19 ppm change
STEP 4: Identify the chlorine compound to be used to
increase the chlorine level, plug in the amount to increase the
chlorine, and use the following formulas:
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Make sure the pH is within the acceptable range of 7.2-7.8. These chlorine compounds will signifigantly change the pH and affect the effectiveness of the chlorine.
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You must know the volume of water the pool holds.
1. Calcium Hypochlorite .125 x ppm change x pool volume/10,000
= pounds
pH 11.8, granular and
tablets
2. Sodium Hypochlorite .1016 x ppm change x pool volume/10,000 =
pounds
pH 13.0, liquid
3. Lithium Hypochlorite .250 x ppm change x pool volume/10,000 =
pounds
pH 10.7, powder
4. Chlorine Gas .08125 x ppm change x pool volume/10,000 = pounds
pH <1.0, gas
note: " / " means divided by, x means
multiply
EXAMPLE:
The free available chlorine (FAC) is 1.0. The operator has decided
to raise the chlorine to 20ppm and keep the pool closed for 8 hours to
satisfy the "9600 rule" and will use Calcium Hypochlorite. Volume
of the pool is 200,000 gallons.
20 ppm (chlorine level to be reached) - 1.0 ppm (FAC present)= 19ppm
change
.125 x 19 x 200,000/10,000 = 47.5 pounds of Calcium Hypochlorite that
must be added to the pool.
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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