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SWIMMING POOLS
POOL SHOCKING

Non-chlorine vs. Chlorine Shock on Algae (9/2/98)
Shock Choices (6/22/98)
Liquid vs Granular Shock (6/11/98)
Chlorine Lock (6/11/98)
Pool Shocking (5/6/98)

 

 

Non-chlorine vs. Chlorine Shock on Algae (9/2/98)

Q:
I would like to know if non-chlorine shock is as effective on algae as chlorine shock.

P.S. - Jacksboro, TN

A:
Non-chlorine shock is a great product for giving a quick boost to the chlorine level or help destroy combined chlorine.

To treat algae it is necessary to boost the FREE CHLORINE level high enough and for a long enough period to kill and destroy all the algae. Concentrated chlorine products work best in this application -- especially in severe cases.

Afterwards, adding some non-chlorine shock can help convert the combined chlorine into Free Chlorine.

I hope that this information will be helpful.

Sincerely,
Alan

 

 

Shock Choices (6/22/98)

Q:
Alan, we have a 27' 16000 gallon above ground pool and just this year switched from Softswim (because of pink slime in hot weather) to Chlorine. After much frustration I finally found out that what appeared to be sand returning to the pool was actually the calcium. After backwashing this out I am about to switch to the organic shock which is supposed to alleviate the problem. Please advise as to how this is normally handled as the organic shock is much more expensive to use. Thanks for your advice and time.

S.E. - Harrisonburg, VA

A:
If the calcium hardness level in your pool water is over 400 PPM, that is reason enough to switch to another type of product, in order to avoid problems associated with continued buildup.

I assume that the organic shock you are referring to is dichlor. If you are using trichlor tablets, I would not consider this to be good choice because it will speed up the build of cyanuric acid, over time, to the point where partial water exchange will be necessary.

Other choices include products such as
SUN Lithium Shock, SUN Brite Non-Chlorine Shock or Liquid Shock.

Depending on your water chemistry, the most economical product might not be the best choice for water clarity and quality. You will have to weigh the factors.

I hope that I have been of assistance.

Sincerely,
Alan

 

 

Liquid vs Granular Shock (6/11/98)

Q:
I would like to know, what would work best when I shock my pool once a week Liquid chlorine or Granular Shock? And what is the difference? Do they both contain chlorine? Or are they for two different things?

S.C. - New Haven, CT

A:
Both products contain chlorine and are suitable for the same purpose.

The liquid products typically contain much lower concentrations of chlorine than do the granular products.

The liquid products are mostly water and that is a consideration when bringing it home.

I hope that I have been helpful.

Sincerely,
Alan

 

 

Chlorine Lock (6/11/98)

Q:
Every year for the past 4 or 5, I have had a hard time obtaining a free chlorine level when I open my pool. I remove the cover, the water is clear, I run the filter for 24 hrs and then shock with the required dose of cl shock The water is clear, but I can't register a free chlorine reading. When I check for combined cl it's off the scale. I have been told by the pool pros that I need to apply a massive dose of shock to break the chlorine lock. This screws up my chemistry and is very costly. My question is: will the non cl shock break the cl lock easier, and if so can I get away with using less?

T.M. - Cherry Hill, NJ

A:
You obviously have a high combined chlorine reading, although it is not necessarily clear as to why.

To destroy all of the combined chlorine, it is necessary to exceed the combined chlorine by a factor of approximately 5-10 times as much free chlorine.

Using a non-chlorine shock, such as
SUN Brite, could reduce some of the combined chlorine while increasing the free chlorine. It is a practical way of dealing with problems such as you have described.

Enjoy the season.

Sincerely,
Alan

 

 

Pool Shocking (5/6/98)

Q:
I have a 24' above ground pool. Can higher amounts of granular chlorine be used in place of shock? How often should a pool be shocked?

K.P. - Krebs, OK

A:
Granular chlorine can be used as a shock with some reservations. Never use trichlor granular in a vinyl pool because of possible bleaching of the loner. Dichlor will cause the stabilizer level to rise too fast. Your best bet is calcium hypochlorite or lithium hypochlorite as a granular shock treatment. Shock any time the chlorine level bottoms out, after periods of heavy bather load, at first signs of algae and after periods of heavy rain.

I hope that I have been of assistance.

Sincerely,
Alan



 

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