Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 21

Thread: Calcium hypo tabs

  1. Back To Top    #1

    Join Date
    Apr 2014
    Location
    birmingham al
    Posts
    6

    Calcium hypo tabs

    I have decided to forgo the TriChlor tabs because of high CYA levels last year. Does anyone have any experience with the Calcium Hypo tablets. If so can they be used in the inline chlorinator.

  2. Back To Top    #2
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Calcium hypo tabs

    I would be careful of Calhypo anything. Once your CH gets up high enough, which could be sooner rather than later if your fill has high CH, you will have scaling. Have you looked into a Salt Water Chlorine Generator (SWG) ?

    Also, it would be helpful if you added your pool and equipment details to Your Signature.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Calcium hypo tabs

    Cal Hypo tabs are generally used in sewage sanitation and don't stay "solid" for long. Folks report them turning into a gooey mess.

    Cal Hypo tabs put in an inline chlorinator can have an explosive component that I have no interest in learning more about.

    In short, don't use them.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Apr 2014
    Location
    birmingham al
    Posts
    6

    Re: Calcium hypo tabs

    Dave, Thanks for the information. I am searching for an alternative to the stabilized chlorine. One of the major pool chemical companies has a non stabilized cal hypo tab that they say is designed for the skimmer and I have talked with their rep and have been told it works good in the skimmer. My pool supply store has no experience with them.

    I have kept my pool running all year with adding the granular calcium hypochlorite on a daily basis or as needed. Pool chemistry is good now.

    18,000 gal vinyl pool hayward pump and filter.

  5. Back To Top    #5
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Calcium hypo tabs

    What do you mean by "good?" What is your CH level?

    I've done a little research on Calhypo tabs. Accutab makes 3" tablets that do stay solid.

    They state they are 68% active chlorine, so using PoolMath's 65% setting, If the tablets are 8 oz, per your 18,000 gallons, each tablet would add a little more than:

    FC - 2.1 ppm (only 70% of trichlor's FC per tablet)
    CH - 1.5 ppm

    Over the course of a season that could really add up. A typical 25 lb bucket give a little more than:

    FC - 107
    CH - 76


    The same bucket of Trichlor would give:

    FC - 152
    CYA - 92

    (You would need to add 64 lbs of Borax or 32 lbs of Washing soda over the course of the season to to make up for the acidity of the trichlor tablets.)


    Also keep in mind, most users will need more than one bucket for 90-days of use. So in the end Calhypo tablets have less FC than trichlor but do not have the problems of rising CYA and pH going down.

    It all boils down to your current CH level, your seasonal rainfall and your fill water CH. You may also want to factor in the cost of CH test reagents. They are one of the more costly reagents to get per oz.

    On the other hand, if you don't want to have to worry about feeding tablets or pouring liquid chlorine in every day or two, again I advise you to look into Salt Water Chlorine generators. They can be had for as little as $150 plus the cost of salt, the majority of which is a one-time purchase. If you do look into the cheaper Intex models, find one without anything extra like Copper or Ozone.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Calcium hypo tabs

    Accutab looks like it is directed at larger, commercial pools. I will find out more tomorrow.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Calcium hypo tabs

    Sustain Blue Tabs are another possibility.

    My understanding was that AccuTabs only worked in their specially designed feeder.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  8. Back To Top    #8
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Calcium hypo tabs

    I'm not sure I buy how "special" their feeder is.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

  9. Back To Top    #9

    Join Date
    Apr 2014
    Location
    birmingham al
    Posts
    6

    Re: Calcium hypo tabs

    Dave / Jesse, thanks for all the info. My pool chemistry tonight was Cl 3, Ph 7.4, Acid demand 110 CYA 40. I have not tested CH so I do not know. Tonight I have brushed the pool, removed the lights from their niche and brushed, super chlorinated and added preventive algaecide. Based on all the info provided I have decided to continue Trichlor for my away (i travel) periods and monitor CYA regularly. Will use sodium hypo or cal hypo for daily maintenance. I am not going to put it on auto pilot ever again. Probably high CYA was the reason for the yellow algae last season. Have not seen any this year but not taking any chances.

  10. Back To Top    #10
    bridgman's Avatar
    Join Date
    Mar 2014
    Location
    Bowmanville, ON Canada
    Posts
    461

    Re: Calcium hypo tabs

    Quote Originally Posted by JesseWV View Post
    I'm not sure I buy how "special" their feeder is.
    I don't think it's "special", just "different" so you don't accidentally get trichlor in contact with cal hypo.

    http://www.chemaxx.com/pool_chemical_explosion2.htm

    And yes, my first thought was "cool, I gotta try that".
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

  11. Back To Top    #11
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Calcium hypo tabs

    AccuTabs don't work in standard trichlor tablet feeders, even ignoring the explosion risk if you ever use trichlor in the same feeder. A couple of people have tried that and they dissolve way to quickly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  12. Back To Top    #12
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Calcium hypo tabs

    It must have a lower flow rate around the tablet(s). Dialing it in just right could be challenging using a standard feeder, but it's probably doable with a good valve and the right plumbing.

    As for the explosion risk, I noticed the Accutabs are tinted blue which helps but certainly doesn't make it idiot proof. I wonder what they've devised to stop people from putting Trichlor tablets in the Accutab feeder. The tablets seem to be the same form factor.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

  13. Back To Top    #13
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Calcium hypo tabs

    That may be why they are for commercial pools only. Commercial pools are legally liable for reading directions and following them in a way that homeowners are not.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  14. Back To Top    #14

    Join Date
    Jun 2011
    Location
    San Antonio, TX
    Posts
    6

    Re: Calcium hypo tabs

    I've had CYA issues in the past as well and had to drain most of my 55k gal pool to get it back under control.

    Since my drain and refill Ive been using this stuff called Refresh. It's granular 73% cal-hypo without stabilizer sold in 25lb buckets.

    The pros are it is a strong chlorine source - albeit it's not without its side effects. Too much of this stuff and you will eventually have scaling issues caused by too much calcium. My CH levels are through the roof, but I haven't experienced any problems with how the water looks.

    I buy the stuff locally from poolzoom.com here in San Antonio. You can order some via the website.
    http://www.poolzoom.com/refresh-plus-25-bucket-73.html

    I have purchased a SWG but haven't got around to installing it yet.
    Good luck
    DrummerDan in San Antonio, TX, 55k gal, Rectangular in ground plaster, Single speed pump, Giant sand filter, Polaris robotic pool cleaner, CompuPool Salt-Gen

  15. Back To Top    #15

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Calcium hypo tabs

    I had a nice discussion with Accutab. In a nutshell, I would not consider them as a viable source for chlorine FOR RESIDENTIAL POOLS....their dispensers are not erosion type dispensers like the ones for tri-chlor and are much more expensive and typically will require some type of sophisticated timer to function properly.

    Briefly, the tri-chlor tabs are immersed in water and the water passing over and around them slowly, slowly dissolves the tab.

    Cal-hypo feeders DO NOT immerse the tabs in water. Instead, the water is brought in so it only moistens the bottom half of the bottom tab....about 1/2 "

    This bottom tab then dissolves and the next tab moves down into the feeder where it is exposed to that pool water passing ONLY across the bottom of the lowest tab.

    I probably have some details incorrect but the major point is Cal Hypo tabs have some great applications but a residential swimming pool is not one of them unless you want to spend some significant money for a pretty sophisticated system.

    They simply will not work well in a tri-chlor feeder.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  16. Back To Top    #16
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    9,002

    Re: Calcium hypo tabs

    So much for just chunking those Accutabs in the skimmer then?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  17. Back To Top    #17

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Calcium hypo tabs

    You know, my bet is you could toss maybe a couple in the skimmer and, pump running, they would dissolve quickly and be just fine.

    I just don't need the extra hassle of worrying about them when they don't dissolve.......I don't think you can successfully take them out.

    As always. Clorox is our good friend!!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  18. Back To Top    #18

    In the Industry

    Join Date
    Mar 2014
    Location
    Cape cod
    Posts
    8

    Re: Calcium hypo tabs

    I work with accutabs quite a bit on our commercial pools. Would defiantly work in a pinch in the skimmer but as someone else stated they are not designed to be fully submerged, they will turn to mush and dissolve quickly. The lids on most the accutabs ppg feeders are clear so when they are all stained yellow you know someone put trichlor in. I'm a bit partial to ozone. Can really decrease your demand for chlorine, and along with it the byproduct such as cya and calcium. works best with a vs pump on low speed so it can run 24hrs

  19. Back To Top    #19
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Calcium hypo tabs

    Quote Originally Posted by Bobby72 View Post
    I'm a bit partial to ozone. Can really decrease your demand for chlorine, and along with it the byproduct such as cya and calcium. works best with a vs pump on low speed so it can run 24hrs
    Well you are in the minority here as they do not make sense in residential outdoor pools. In fact they are more likely increase the chlorine demand when the swim load is low. Plus they leave no residual sanitizer the bulk the water leaving a person at risk of person to person transmission.
    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!

  20. Back To Top    #20

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Calcium hypo tabs

    I work with accutabs quite a bit on our commercial pools.
    I would not consider them as a viable source for chlorine FOR RESIDENTIAL POOLS....
    Apples and oranges?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •