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Posted: Fri Jul 21, 2006 9:42 pm Post subject: Check your pools
This is now the time of year when pools go Green and even if they have not gone green they may be harbouring bugs waiting to give us ear, nose and throat infections.
Really need to keep checks on pH and maintain this between 7.2 - 7.6. above this and your chlorine efficiency drops like a stone for example:
With your pH at 7.2 the effectiveness of Chlorine is approx 75%
With your pH at 8.5 the effectiveness of Chlorine is only 8%
Additionally if you are using multi-chemical tablets you really need to test your chlorine stabiliser levels.
I have recently tested several pools that have been treated to multi-chemical tablets which after 2 years have up to four times the reccommended levels of chlorine stabiliser and are likely to soon become overpowered with 'chlorine stabiliser' which can lead to a condition known as 'Chlorine lock' where you have plenty of chlorine in the pool but it's so stabilised that it cannot work = bugs in pool!
We are getting a lot of calls regarding GREEN pools.
When this happens:
1. Check and adjust pH - if it's very green drop pH below 7 for the short term - Normal should be 7.2~7.6 NOT more.
2. Ensure the filtration system is running long enough - All the water should go through twice a day.
3. If you must, use Chlorine granules and take the Chlorine up to 10ppm - don't use the pool until it is down to .6~2ppm
4. Always maintain the pH as close to 7.2 as possible - not below 7 long term - it will remove the tile grout.
If you are using tablets don't put them in the skimmer - use a 'Floater' Chlorine in the skimmer basket will rot the valves, pipes, pump and filter - nice if you want to re-plump the pool and buy a new filtration system.
Posted: Mon Feb 16, 2009 11:25 pm Post subject: Bacteria Control
Chlorine and pH - provided the pH is maintained around 7.2~7.4 you will be able to save money on how much chlorine you will need to use in your pool - With a pH around 8 you will only get 20% effective use from your chlorine with the pH at 7.2 it will be up to 70% effective
The other thing that will potentially be affecting the pool is the
amount of Cyanuric Acid you have put in the pool.
The maximum amount is 100ppm but really above 40ppm is wasting money and reducing the effectiveness of your chlorine and eventually if you continue to add Cyanuric Acid you will stop the chlorine altogether.
Remember the Chlorine stands between you and bacteria.
We are not talking common cold.
Pool control is about adding chemicals in the correct amount rather
than over or underdosing, both are ineffective and money wasting.
Use a flocculant as well 'Jolly Gel' is excellent and will enhance
your pool sand filter efficiency enabling it to filter down to 2~5microns the effect is a sparkling clear pool.
A sand filter will filter from 18~50 microns if you are lucky.
It is a good idea to periodically add 'NoPhos' to your pool to get rid of phosphates which bacteria can thrive on.
Additionally remember to give your pool a good regular brushing to
remove the slippery surface that gets on all pool surfaces, in this
slippery surface the bacteria lives and is protected from Chlorine by
The new filtration medium on the market is recycled crushed glass 'AFM' this will last probably the life of the system and provide filtration down to
2~5 microns - like using floculant all the time, resist bacteria growth and will pay for itself in a short time.
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