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Thread: Pool Heater Warranties and suggested Chlorine Levels

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    Join Date
    May 2015
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    Pool Heater Warranties and suggested Chlorine Levels

    I have installed a new Jandy JXi400 natural gas heater (copper heater core). I have installed bypass valving so that I can take the heater off-line when doing adjustments to my water chemistry (SLAMing, PH, Hardness, etc) so that the unbalanced water does not pass through the heater core. I currently use trichlor tablets for chlorination, which I would like to get away from due to the adverse effects of increasing CYA. Lowering pool levels and refilling is massively expensive in the Charlotte, NC area. I have a few questions regarding the heater suggested guidelines for water chemistry and some of the suggestions made by your pool calculator.
    1) Heater manufacturer states max. FC = 5ppm pools, 10ppm spas. Why the difference? Is it because spas water is usually set for higher temperatures? I notice on some threads that contributors state that they would never let their FC get below 5 and prefer around 10, which, the way I read it, voids the heater warranty and can possibly cause heater core damage. Not to mention not real good for ANYTHING that gets in the pool (kids, dogs, frogs, algae, etc...not real concerned about the last two). Clorox even states in their guidelines that this is a violation of federal law because the product is being misused. Also, if CYA is above say 50, then you would have to violate the heater manufacturer's suggested/within warranty guidelines. Thoughts/suggestions? I really don't care about warranties (not worth the paper they're written on), I just don't want to purposely damage the heater core. My CYA is currently high (80) so my FC should be >6ppm, above the 5 suggested by the heater mfg. ugh!
    2) The Liquidator liquid chlorine feed system, which I am considering as an alternative to trichlor tabs, feeds chlorine into the pump suction line "before the strainer basket". This chlorinated water then passes through the pump, then the filter, then through the heater. I can only guess that the chlorine level of this water is elevated above the heater manufacturer's specs. In fact, some heater manufacturers state that all chlorine generating equipment be located downstream of the heater with check valves between the chlorinator and the heater. Along the same lines you always see "never put chlorine tabs in the skimmer" because all that highly chlorinated water passes through and can damage your equipment.
    3) SWG is out, because many manufacturers (including Jandy) prohibit SWG chlorine in their units.

    Any thoughts or suggestions on how I can switch to liquid chlorine and avoid the above pitfalls, other than chlorine injection pumps ($$$) or walking around the pool everyday adding chlorine?

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    Mod Squad jblizzle's Avatar
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    Re: Pool Heater Warranties and suggested Chlorine Levels

    Please add your pool details to your signature as described HERE as it will help us help you and may impact our responses.

    BTW, for #3 ... I have never heard that a pool company prohibited running a SWG through a heater. We have 1000s of members who do that.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Pool Heater Warranties and suggested Chlorine Levels

    This website is where I ran into the not suited for SWG on some heaters http://poolheaterguide.com/gas-pool-heater-reviews/. Now, to be fair, Jandy says their JXi units are suitable for SWG.
    30Kgal, IG, Vinyl, 300sgft Sta-Rite Cartridge Filter, Hayward 1.5HP pump, GPM?, Hayward CL200 chlorinator, Jandy JXi 400K heater, Polaris pool cleaner system, pool installed 1996, city water refill

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    Mod Squad jblizzle's Avatar
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    Re: Pool Heater Warranties and suggested Chlorine Levels

    Well, they do not even say WHY it is not recommended for SWG ... although I would trust the manufacturer over some website ... {is that hypocritical of me }
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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