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Thread: Is it possible to switch every year from Trichlor to Cal-Hyp

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    Is it possible to switch every year from Trichlor to Cal-Hyp

    I have read about the bad things associated with each, but has anyone used their inline chlorinator and just switched every year between trichlor and cal hypo? Does it work to keep CYA and CH down? Thanks

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    Mod Squad zea3's Avatar
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    Re: Is it possible to switch every year from Trichlor to Cal

    You cannot use trichlor and cal-hypo in the same container. If you put cal-hypo in a chlorinator that once held trichlor or visa versa the chemical reaction could cause a fire and explosion.
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    Re: Is it possible to switch every year from Trichlor to Cal

    You cannot use the in-line chlorinator for anything but the tabs it is designed for. You can use Cal-Hypo as a powder in the pool whenever you wish, but not in the chlorinator.

    You are in my area, so you may be able to do what I do. In a normal wet winter, the CYA and CH drops, TA stays the same or goes up depending on the ratio of rainwater (TA = ~ 0?) vs tap water (TA = ~ 340).

    So, in a normal spring, I test to see where the levels are for CYA and CH and start with either trichlor tabs in the chlorinator, or by adding cal-hypo powder in the shallow end and using the Wall Whale brush to mix it in. That choice depends on what level is the lowest and how long it will be until I am off on vacation. I try to run at the low end of the CYA level until that first vacation.

    While I am gone on vacation, I load up the in-line chlorinator and set it at medium or low, just guessing at how much attention the pool sitter will actually pay to the chlorine levels while I am away. I hate to have them lugging bleach bottles when they have other house sitting chores to tend to. When I return, I do a full test of the pool and re-figure what source of chlorine I need to be using. Most likely I turn to bleach at that point.

    However, this winter was not wet, we've had nearly no rain for 7 months, so the CYA started out at perfect levels from last years use of tabs, and the CH was perfect from last years use of cal-hypo. So, my vacation use of the in-line chlorinator this year has run the CYA up to not-good levels. (Sigh.) That will be where it sits until we get a wet Tropical Storm I guess, for I cannot drain and refill at all at this point in the drought. So for now, I use bleach, and try to keep it indoors where the heat will not degrade it too fast.
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    JasonLion's Avatar
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    Re: Is it possible to switch every year from Trichlor to Cal

    Generally over several seasons the CYA and CH levels will build up and you will eventually have problems with both. CYA sometimes vanishes over the winter, which can help with using trichlor, but calcium doesn't do that and will continue to build up.
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    Re: Is it possible to switch every year from Trichlor to Cal

    Here in this part of Texas, winter effects are unpredictable.

    Sometimes we get low humidity and therefore a lot of evaporation. If rains are not enough to overflow the pool and only replace evaporation, no change in levels occurs. If there is enough evaporation that fill water, high in TA, is required, pH will tend to rise with the rising TA but CH and CYA are unaffected.

    Sometimes we get enough rain to fill the pool to overflowing. I recall a day with 4 inches of rain in a week with 8 inches of rain. The pool overflows and all that perfectly balanced pool water is replaced with rain. One time will make a small change, but a winter of 40 inches of rain will add up if a large portion of it is overflowing rain.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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