WATER BALANCE
POOL SHOP OR MANUAL WATER TESTING
The Pool Lab ASP will automatically test your pool or spa water for Free Chlorine and pH
levels only. Other important water balance parameters such as Total Alkalinity, Calcium
Hardness, Combined Chlorine, and Stabilizer level will need to be regularly checked
manually with an appropriate test kit, or by taking a water sample to your local pool shop.
Your local pool shop should also be able to provide you with an appropriate water sample
bottle for this purpose. It is worth noting that many containers are not suitable for pool
water samples, as the materials used in the construction and the previous contents of the
container may drastically alter the results of the water test.
DO NOT USE SOFT DRINK BOTTLES FOR WATER SAMPLES!
A soft drink bottle is a classic example of an inappropriate water sample container. The
water sample will tend to gradually take on the pH level of the previous contents, which is
generally quite acidic. Most soft drink bottles are also transparent, allowing UV light to
enter the container which will break down the chlorine in the sample much faster than
would occur in an opaque container.
Do not be alarmed if the Free Chlorine and pH results of a water test do not exactly match
the readings observed on the display. The Free Chlorine and pH levels of a water sample
are particularly sensitive to change in a small volume of water. Chlorine will break down
rapidly, especially when exposed to heat and/or sunlight. This process can also affect the
pH of the sample.
CHLORINE PRODUCTION AND CONTROL
Free Chlorine Residual
For your health and safety, a free chlorine residual of 1.0ppm to 3.0ppm must be
maintained.
Testing for chlorine levels is very important and should normally be performed on a daily
basis. The Pool Lab ASP achieves this better than any other method or device. Typically
(by default) the ASP will test the chlorine level three times per day and will control the
chlorine level by making adjustments to the chlorine output of your Pool Lab Chlorinator
with calculations based on water volume, chlorinator rating and previous demand.
The ability of the chlorine generator to maintain the correct chlorine level will depend on
the maximum output of the device (as rated in grams per hour), and the demand imposed
by bather load and other environmental factors.
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