Cal hypo feeders?

H2Oburd

Member
Mar 18, 2017
6
Key West, Florida
Moderator comment: 2 Threads merged together

Hello folks. We are getting ready to drain our 5600 gallon tiled pool with an overload of cya. Once we rebalance the fresh water we want to find an automatic chlorine feeder solution that will allow us to keep low chlorine levels of 1 -2ppm, and not build up cya load. We have DE filter and 1hp pump. Appreciate any advice. Thank you.
 

pabeader

LifeTime Supporter
TFP Guide
May 14, 2015
4,349
Cartersville Ga
Re: Auto Chlorination Recommendations

Welcome! :wave:

There are many options for automatic chlorination systems. There are stenner pumps, something called the liquidator and Salt water generators (SWG). I'm sure there are many others, but those are the ones I see mentioned most.
I personally have a SWG style unit. It uses salt from the water to create chlorine which then recombines back to salt.


Please take a look at Pool School from the button up above. There is a bunch of good reading there and it explains a lot of what we are about.


As far as the FC level you are interested in, TFP doesn't look at it that way. What we do is target a certain CYA level and that then dictates the FC level you need to maintain.

Usually when we see somebody asking about low FC levels it comes from something they've either read or been told "That's all you need" this can't be any farther from the truth. The level you need, to have a clean and clear pool is directly related to the CYA level. Once you get that part figured out all the rest will kinda fall into place.


Please feel free to ask any and all questions you may have. There are any number of folks around that will love to help you out.
 

H2Oburd

Member
Mar 18, 2017
6
Key West, Florida
We have recently drained our 5000 gal. pool due to extremely high CYA levels. To avoid repeating our problems with tricolor tabs and CYA build up, and we want to know if anyone has had a positive experience with cal hypo feeders. If so what make?

Thank you.
 

YippeeSkippy

Mod Squad
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Jan 17, 2012
9,412
Evans, Georgia
I believe they are a different type of feeder and each type of solid chlorine (cya or calcium) requires its own type feeder.

The problem with CalcHypo is that instead of getting too high CYA, you get too much Calcium. I guess if you can routinely drain your pool and start again.....<shrug>

Yippee :flower:
 

duraleigh

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In The Industry
Apr 1, 2007
31,530
Sebring, Florida
Don't mess with them. They are in LIMITED supply and only made by one company. My guess is they are pricey as well but I do not know that.
 

pooldv

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Aug 10, 2012
25,173
FL panhandle
Also, note that cal-hypo is explosive when exposed to other chems, including trichlor pucks. An entire ship blew up from a cal-hypo shipment gone wrong. So, handle with care. Like TNT. :)
 

jblizzle

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May 19, 2010
41,195
Tucson, AZ
Also, note that cal-hypo is explosive when exposed to other chems, including trichlor pucks. An entire ship blew up from a cal-hypo shipment gone wrong. So, handle with care. Like TNT. :)
Where can I read about that? :D
 

pooldv

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There's tons! Surprising they even make the stuff anymore.

Other recent cargo explosions on container ships at sea include:
2003 - SEA ELEGANCE involved an undeclared 20' container of calcium hypochlorite (UN 2208) that was stowed below decks aft of the accommodation.
2002 - M/V HANJIN PENNSYLVANIA off Sri Lanka suffered two fatalities from the initial explosion in Hold 4 where no Dangerous Goods (DG) were declared. The fire spread for the next 4 days to Hold 6, also where no declared DG were stowed, where there was a a massive explosion resulting in a $235 million loss.
1999 - CMA DJAKARTA off Egypt had a container of Chinese calcium hypochlorite (UN 2208) stowed above decks ignite and explode.
1998 - ACONCAGUA off of Ecuador experienced an explosion of Chinese calcium hypochlorite (UN 1748) in a hold .
1998 - SEA LAND MARINER sailing off of Crete suffered two fatalities in an explosion and fire of containers on the poop deck. Calcium hypochlorite was suspected.
1998 - M/V DG HARMONY off South America involved the auto ignition and explosion of ten containers of US manufactured calcium hypochlorite stowed in Hold 3.

Carriage of calcium hypochlorite still poses a risk to ships

Maersk bans calcium hypochlorite shipments | News | American Shipper
 

tim5055

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May 11, 2014
10,122
Franklin, NC
You can read about it here, In re M/V DG Harmony

but this is the highlight:
On a voyage from U.S. ports to Brazil, the M/V DG Harmony carried among its cargo ten containers of Calcium Hypochlorite. During the voyage, this product, which is commonly used as a bactericide, began to decompose, generating heat and smoke. The rise in temperature caused further decomposition, which ultimately caused the relatively unstable chemical to explode, blowing the doors off the containers, embedding them into the adjacent containers, and causing a fire so immense that the crew was forced to abandon ship after a grueling eighteen-hour unsuccessful attempt to stifle it. The fire lasted three weeks and, as a result, the US$16 million vessel was declared a constructive total loss and virtually all her cargo was destroyed.
Maersk Line refuses to carry it anymore Maersk bans calcium hypochlorite shipments | News | American Shipper
 

mac4lyfe

LifeTime Supporter
Jun 8, 2007
212
Houston, Texas
Moderator comment: 2 Threads merged together

Hello folks. We are getting ready to drain our 5600 gallon tiled pool with an overload of cya. Once we rebalance the fresh water we want to find an automatic chlorine feeder solution that will allow us to keep low chlorine levels of 1 -2ppm, and not build up cya load. We have DE filter and 1hp pump. Appreciate any advice. Thank you.
Hey H20 - you can add your pool info in your signature which will help people know what equipment you are working with. What type of pool do you have? Plaster, Vinyl? The biggest problem with Cal Hypo is that you are increasing CH and eventually you will have to drain like Yippee Skippy said. We here recommend using liquid bleach and get away from the hard powder stuff which eventually you will have to drain.
 

Patrick_B

TFP Expert
LifeTime Supporter
Jun 7, 2011
14,999
Midland TX
Liquid Chlorine Bleach is readily available in small bulk, fresh, and at good prices in many areas of FL. That would be my suggestion. No worries with side effects and just control your own Cya.
 

SCB

Bronze Supporter
Jan 25, 2017
27
The Woodlands, TX
Also, note that cal-hypo is explosive when exposed to other chems, including trichlor pucks. An entire ship blew up from a cal-hypo shipment gone wrong. So, handle with care. Like TNT. :)

Does this mean the bucket of Cal-hypo packets shouldn't be stored on top of the bucket of pucks like the PB stacked them?
 

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