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 Chlorine Stabilizers


 

 

SWIMMING POOLS
CHLORINE STABILIZER

Trichlor Tablets And Cyanuric Acid (7/9/98)
Cyanuric Acid / Chlorine Loss (6/8/98)
Benefits Of Chlorine Stabilizer (6/1/98)
Chloramines / Cyanuric Acid (5/28/98)
Dissolving Chlorine Stabilizer In Water? (5/26/98)

 

 

Trichlor Tablets And Cyanuric Acid (7/9/98)

Q:
I had my water tested and found that in addition to high TDS (which I had come to suspect) I had high (154) level of cyanuric acid. I drained about 1/3 to 1/2 of the pool and everything has been great since. BUT... I am confused about this. Should I continue to use the 3" trichlor tablets which I assume will slowly raise the CA level again? Or should I try to prevent that by using another form of chlorine?

B.C.

A:
Using 3" trichlor tablets will, over time, raise the cyanuric acid level.

You can minimize this increase by using, as a shock, products that do not contain cyanuric acid. You could use products such as
SUN Brite non-chlorine Shock, SUN Burn Cal Hypo Shock, SUN Burn 35 Lithium Hypochlorite Shock. These products can be used to supplement the 3" tablets and allow you to set the chlorinator at a lower setting.

The 3" tablets do offer the convenience of being slow dissolving and afford a degree of continuous chlorination. Is this worth the occasional replacing or water?

Replacing some of the water is probably a good idea anyway.

I hope that I have been helpful.

Sincerely,
Alan

 

 

Cyanuric Acid / Chlorine Loss (6/8/98)

Q:
I was wondering what the "normal" rate of loss of chlorine is from a 25,000 gallon pool. I live in Little Rock, it is hot and sunny, I keep the cyanuric levels above 40 ppm. How much chlorine should I expect to add and how frequently?

G.M. - Little Rock, AR

A:
Cyanuric acid helps protect free chlorine from destruction by the Sun's UV light. The loss of chlorine is reduced but not eliminated.

The rate of chlorine loss depends on many factors including: water temperature, sunlight exposure, wind exposure, quantity and nature of organic wastes introduced by bathers and the presence of wind-blown and tracked in debris.

It is not possible to come up with a definitive figure for chlorine consumption. It varies with the ever changing conditions. Fortunately, a pool having a large reservoir of chlorine in the water can maintain an adequate level of sanitation throughout the day with proper replenishment.

A typical 25,000 gallon pool, with a free chlorine level in the 1-2 PPM range, will require 1/5 pound of chlorine (based on 100%) to raise the level 1 PPM. How long the 1 PPM lasts depends upon the bather load and other factors.

As the pH goes up the efficiency of the chlorine goes down, making it even more difficult to speak in precise terms.

I hope that I have been helpful.

Sincerely,
Alan

 

 

Benefits Of Chlorine Stabilizer (6/1/98)

Q:
This is our first year as home owners as well as pool owners. I have heard from friends that adding "chlorine stabilizer" to the pool will be a great benefit. I was recently at the local Wal-mart and was going to purchase some, but the instructions on the container did not explain how much or how often to add it to the pool. The pool holds about 24,000 gallons of water and right now the chlorine level is fine.

A:
Adding chlorine stabilizer will reduce chlorine consumption by offering protection from the Sun's UV light. In the long run it will more than pay for itself.

In northern areas, a 24,000 gallon pool will require approximately 6 pounds, if there is no cyanuric acid already in the water.

Have the water tested before adding the product.

Enjoy the season.

Sincerely,
Alan

 

 

Chloramines / Cyanuric Acid (5/28/98)

Q:
My pool supply store tested the water from my pool and said that it was very high in chloramines from the stabilizer and was about to "lock up" i.e. the chlorine would become ineffective. He said the only way to reduce the chloramine level was to drain and refill the pool (partially or completely) and dilute the existing level or start over. Is this all true and is there another way to reduce the level? The water in the pool is about 8 years old and I have always used 1" trichlor tablets in a hayward automatic chlorinator.

L.M. - Frederick, MD

A:
You don't quite have it right.

Chloramine is combined chlorine and is measured by the difference between the free and total chlorine readings. Chloramines are irritating, odorous and ineffective. It is one of the reasons that pools are shocked periodically.

Cyanuric acid functions as a chlorine stabilizer and can be tested with appropriate apparatus. The only way to lower the cyanuric acid is to replace all or part of the water. The cyanuric acid level builds up over time, if you are using a stabilized chlorine product. High levels, especially over 150 PPM, will reduce the effectiveness of chlorine, making a water replacement a prudent step.

I hope that I have been of assistance.

Sincerely,
Alan

 

 

Dissolving Chlorine Stabilizer In Water? (5/26/98)

Q:
I purchased an in-ground pool last year and for the second year in a row, my dealer has told us to dissolve Sustain chlorine stabilizer in warm water and then slowly pour it in through the skimmer. However, the stabilizer doesn't seem to dissolve no matter how long I stir it or how warm the water is. I'm confused! Please help.

K.P. - Lebanon, NH

A:
It is not practical to try and dissolve chlorine stabilizer in a bucket of water. The chemical is not that soluble!!!!

Most people will broadcast it into the pool and allow it to dissolve over time. The product will sink to the bottom and will dissolve over a period of days depending upon the temperature, circulation and pH.

You can also add it directly to the skimmer, with care!!!!!!!!!!! Add it slowly, in increments, to the skimmer. Adding it quickly could clog the pipes or pump basket.

I hope that I have solved the problem.

Sincerely,
Alan



 

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