Posts Tagged ‘Algae’

Pools And Heat Waves

Bob Russell | July 9, 2012 in Equipment maintenance,Pool,Pool chemicals,Pool Service,Uncategorized | Comments (0)

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Heat Waves:

Every pool owner should understand two basic concepts about their pool during a heat wave:

1) Chlorine demand (or which ever sanitizer you are using)

and…

2) The Petrie Dish 

Chlorine Demand is basically the understanding that it will take more chlorine to maintain a sanitary and clear pool under certain conditions. Chlorine demand increases during a heat wave because the things that “spend” chlorine tend to increase- these include: increased bather load; heavy thunder showers (including wash-ins); higher temperatures.

The second concept of the Petrie Dish helps the pool owner understand and visualize that without a sanitizing agent present in the water, algae or micro-organisms can grow very fast.

In the “perfect storm” of heavy bather load, thunder storm and high temperatures a pool can go from the ideal of 3.0 ppm chlorine to zero in a day. Generally a chlorine feeder cannot recover to 3.0 ppm by the time algae or micro-organisms have already started to multiply. Once plant and animal life has been established in a swimming pool, the chlorine demand can double or triple quickly. Unless you intervene, you will have a real problem and it all can happen in 24-36 hours.

Here’s what you can do:

  1. First, understand these two concepts. Awareness that something is happening before the pool is green, or someone gets an ear infection is best.
  2. Adjust chemical feeders to handle an increase in bathers.
  3. Careful with use of time clocks! I see this all the time- a pool owner trying to save $100. on their monthly electric bill winds up spending $500. to kill algae that has gotten out of hand. Chemical feeders are only adding sanitizer to pool while pump is running.
  4. Check pool water after a heavy storm or a pool party. This, more than anything, will help you understand chlorine demand and keep you aware when you need to do something between normal weekly service visits.

Enjoy!

For more information about pool and spa service, check out “Water Blog” on our website!: www.glengatecompany.com