Ultra violet pool sanitation

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dollard
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Joined: Sun 05 Aug, 2012 09:07
Location: mexico

Ultra violet pool sanitation

Postby dollard » Thu 20 Jul, 2017 08:59

I asked awhile back about using UV lights to sanitize our communal pool.
It has now been done. Our pool is about 120,000 gallons. The water for it comes from wells that reach down to hot water (about 130° F). The pool has two large sand filters but no heating system. 3 to 4 times a week the pool is lowered to allow room to add hot water from the wells to heat it. The pool is kept at a temperature from 86° to 102° F. Some chlorine is added to the pool. The water is fairly mineralized and the pH is over 8. In the past we have had problems keeping the pool clean.
So the following changes were made to our system to try and improve the water quality;
2 Spectralight UV lights were installed after the filters, 2 chlorine dispensers-Interwater Clorador Model 1W-0680, and 3 new 2 speed Hayward pumps were installed. It has been 2 months now and the pool is often quite green and cloudy but may be sanitary. Chlorine levels in the pool are now from nil to trace.
The water that was drawn down from the pool went to cisterns where is was stored for watering. Any excess ran down the street.
Our water supply for the homes in our subdivision comes from the same hot water wells. It is stored in several cisterns from where it is sent to the 300 some properties at various times. Now some of the water drawn down from the pool is sent to these cisterns that supply the homes in our subdivision.
Does anyone have any thought or suggestions about this arrangement?


dollard
Pool Enthusiast
Pool Enthusiast
Posts: 25
Joined: Sun 05 Aug, 2012 09:07
Location: mexico

Re: Ultra violet pool sanitation

Postby dollard » Thu 27 Jul, 2017 09:08

I didn't get any replies to my first post so I will try another.

This is the setup in our subdivision. All ~350 homes have septic tanks. The two wells that supply the water for the houses are deep underneath the homes.
So most of the water from these wells is pumped to a large cistern where it is distributed several times a week to the homes. Some of the hot water from these two wells is also sent to our communal swimming pool 3 or 4 times per week to heat the pool. Before the hot water is added to the pool it has to be lowered from 4 to 16 inches (depending on the time of year) to make room for the hot water. Some of this water that is taken from the pool is sent to the cistern that supplies the homes. As mentioned earlier the water coming to the pool from the wells and that coming from the pool to our drinking water cistern is filtered, passed by UV light, and then some chlorine is added.
Now this water in the pool and the water going to the homes from the pool is tested regularly for coliform and fecal coliform. My question is-should other tests be done on this water?
Denniswiseman
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My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Ultra violet pool sanitation

Postby Denniswiseman » Thu 27 Jul, 2017 15:53

I think that what you are talking about is specialised and wouldn't come within the remit of this forum
Although a properly sanitised pool water should be OK I wouldn't be to keen on drinking it on the off chance that something nasty was lurking in it. Can't the pool water just be used for irrigation
To prevent an algae bloom you need chlorine relative to your Chlorine / CYA Chart as indicated in Pool Levels
Try posting on http://www.troublefreepool.com and maybe a water purification tech might have some ideas

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