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Thread: FC levels with Ultra UV and Clear O3

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    Apr 2014
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    FC levels with Ultra UV and Clear O3

    Does anyone have any data that supports being able to leave the pool at a lower than suggested minimum FC level with the use of the Paramount Ultra UV and Clear O3 combination?
    My FC has dropped to less than 1 a couple times for a couple days at a time this summer, and I shocked it, but I am curious if my Paramount equipment has helped, or really any opinions at all about this equipment.

    Here are my numbers today.

    PH 7.6
    FC 3
    CH 500 - yikes
    CYA 40
    TA 60

    Thanks.

    Rich
    9500 gallon in-ground w/spa, Quartzscapes Montego Bay, Water leveller
    Hayward Cartridge C3050, Hayward 2HP Tristar 2 SP, Paramount Ultra UV, Clear O3 ozone, ProLogic PS-4,
    Hayward H series 400k, 2 Skimmers, ColorLogic Mutlicolor LED's
    Hayward Super II 1.5HP, 2 waterfalls, and a bubbler on the baja step

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    Re: FC levels with Ultra UV and Clear O3

    Not for a pool.
    UV - Lower FC

    If your pool is outdoors and you are not running a public-pool level of bathers, they are unnecessary. I have a ClearO3 also and I shut the valve on it.

    For your spa it can do some good to run the ozone right after people get out, then you could use less Chlorine eradicating the waste.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    duraleigh's Avatar
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    Re: FC levels with Ultra UV and Clear O3

    +1 what BC said. Not helpful for a residential pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JoyfulNoise's Avatar
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    Re: FC levels with Ultra UV and Clear O3

    UV and ozone both interact with free chlorine (hypochlorous acid and hypochlorite) and oxidize it to chloride. Therefore, depending on the output levels set for the ozonator and the UV lamp source, they both have the potential to drive up chlorine demand. It is also true that ozone does oxidize some bather waste and organics and UV does kill certain specific pathogens better than chlorine (cryptosporidium is one of them). See this EPA Document for Ozone and this EPA document on UV. However, in low bather-load residential pool chlorine oxidizes bather waste just fine and UV only kills pathogens that make their way into the UV cell through normal water flow; any pathogens stuck to the walls (algae) or biofilms in the pipes (bacteria) are unaffected by the UV. As well, many of the pathogens that are claimed to be better killed by UV are diseases that require a sick person to go swimming in the pool; that's a bigger problem for public/commercial pools than for private, residential pools.

    So, as previously mentioned, in a residential outdoor pool that gets daily sunlight, chlorine is the most efficient and effective treatment.

    Many pages of posts and threads have discussed the issues around using alternate sanitizers and you can easily find them in the search bar. The claim that these systems can allow you to use "less" chlorine is specious at best. If anyone wanted to use less chlorine, then you could do it much more easily by supplementing the water with polyquat-60 algaecide, adding borates to the water and making the water as nutrient-deficient as possible by using a phosphate-reducer product like PhosFree. Then one could possibly operate at a lower FC/CYA ratio. However, one will notice right away that doing so will likely raise the cost of keeping the pool clean because not only is chlorine still being used, but one is also adding more chemicals to the water that are not cheap.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: FC levels with Ultra UV and Clear O3

    Thanks yall.

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    Re: FC levels with Ultra UV and Clear O3

    As for your question of whether either UV or ozone helped prevent algae growth when the FC got too low, the answer is maybe. There is no question that any algae that is free-floating and got circulated would have been killed by the ozone system and at least some killed by the UV system (if the UV is sized for disinfection, then it kills bacteria readily, but algae is a slower kill so not all may be killed). The problem is that not all algae nor pathogens conveniently circulate through the water and many prefer to stay stuck on pool surfaces. In that case, ANY system that depends on circulation through the system will do absolutely NOTHING to kill such algae or pathogens on pool surfaces or otherwise not getting circulated.

    Don't forget that the rate of algae growth is also dependent on the amount of algae nutrients (phosphate and nitrates) in the water though such growth is ultimately limited by sunlight and temperature. So it is also possible that your pool was poor in algae nutrients and that the limited algae growth when the FC was low was not due to the UV or ozone systems. In fact, I had a very long discussion in this long thread on another forum where the pool owner wanted to operate with a lower FC/CYA level because his wife didn't want much trace of chlorine in the pool (i.e. not to be noticeable at all by her) and had an ozonator that he thought was the reason he didn't get algae. I found out that he had also used a phosphate remover and told him that it was more likely to be the low phosphates that prevented algae growth allowing for the lower chlorine level. He did an experiment where he turned the ozonator off and found it didn't make much difference but then I had him add fertilizer to the pool to increase phosphates and then he could see that even with the ozonator turned on he could not prevent algae growth in the pool without raising the chlorine level.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: FC levels with Ultra UV and Clear O3

    usually it's the pool store that has you dump a bunch of s__ in your pool.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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