Planning to use a pool cover most of the time. Considering a UV system

int0x2e

Member
Aug 7, 2022
8
Israel
Pool Size
8400
Surface
Vinyl
Chlorine
Liquid Chlorine
Hey TFP!
We're in the early planning phase of a new concrete pool.
We live in a warm climate, and want to warm up the pool year round using a heat pump.
To reduce our costs and carbon footprint, I'm hoping to use a pool cover when the pool is not in use. This means very little of the sun's rays will be available to burn off CC.
I would prefer to avoid the need for periodic breakpoint chlorination if possible.

I know UV systems are expensive and have very limited positive impact on sanitation, but I'm really only trying to use UV to burn off CC.

Does this make any sense?
Are there any other ideas I should consider?
Any other advice?
 
I had a UV system. I tore it out.

I have a solar cover that I keep on the pool 24/7, except for swim periods. I have no CC buildup. Tests for CC always 0, so I don't even test for CC anymore.


If you follow TFP, there is no reason for Breakpoint Chlorination.

Breakpoint Chlorination
The 10x rule for breakpoint chlorination is wrong and only now some industry people are starting to address this as described here and here, though they are still only accounting for the mistake of not considering that combined chlorine already used up a chlorine atom in combining with ammonia and they are not yet considering that there is still a factor of 5 error in their approach since the units used to derive the 10x rule come from chlorine (measured in ppm Cl2) oxidation of ammonia (measured in ppm N) whereas combined chlorine is measured in the same units as chlorine (i.e. ppm Cl2) where the Cl2 units are 5 times higher than the N units (that's the molecular weight ratio between the two). The oxidation of a combined chlorine that is monochlorourea (i.e. chlorine combined with urea) may require 3x, but that still far from 10x. There also isn't any getting "stuck" -- one can just add more chlorine. When one has persistent CC, it is not due to getting "stuck" but from compounds that do not oxidize as quickly. More technical details about this are described in this post. Certified Pool Operator (CPO) training -- What is not taught
 
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If you plan to have the cover closed in the summer, in your climate, you will need a cooler too as the water will get very warm. Or at a minimum open the cover at night to allow for evaporation.
 
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