I Am Trying To Close My Pool But I Don't Know How Liquid Shock To Add PLEASE HELP ME?

by Ethan
(Caledonia, MI, United States)

I am trying to close my pool but I don't know how much shock to add to it, it is 16 ft x 32 ft x 4 ft and it holds roughly 170,000 gallons of water, I use liquid chlorine to shock it and I need help figuring out how gallons of shock to add before i close it...


CAN SOMEBODY PLEASE HELP ME... IT WOULD BE MUCH APPRECIATED




Thanks for the question Ethan

It's 1 gallon of liquid chlorine to increase 10ppm per 10k gallons. This is the baseline. I will assume the question meant to say 17k gallons, not 170,000 gallons.

I would treat this as a 20k gallon pool. Use 2 gallons mixed with pool water in a large bucket and broadcast around the perimeter of the pool and sweep very well.

With pool closing, there's a rule that is supreme and it's properly close as LATE as possible and properly open as EARLY as possible. You may still be having day time highs in the 70s. A sealed up pool can reach temperatures into the 90s and higher which is a perfect breeding ground for algae and bacteria.

Your swimming season may be over but I would encourage you, unless you absolutely must, to keep the pool open as long as you can.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Closing/Winterize A Pool" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

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Have a great rest of the Summer.

Robert

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Do I Need To Just Shock, Algacide, A Day Use Stabilizer To Close Above Ground Salt Water Pool w/ Cartage Filter an Crystal Clear Salt Unit ?

by Kathy
(Georgia, USA)

Last year I closed my above ground pool that has a crystal clear salt converter and I used a 6 in 1 shock, put in the amount of algacide for my pool and put in a slow release stabilizer float.

It opened a lot better this year but, I also used an under liner that kept all rain water out. Hoping this is OK to do.

So my question is, am I missing up my pool this way, liner in pool seems to be fine. Thanks for your page, good information on it
kathy in Ga.




Thanks for the question Kathy

First I'll start with the 6 in 1 shock. This is nothing more than Sodium Dichlor which is a stabilized form of granular pool chlorine. There are basically two types of chlorine, stabilized and unstabilized. All different kinds of chlorine fall under these two categories from liquid to granular, pool tabs, lithium hypo chlorine, etc...

This is important to know because if you're shocking the pool with Dichlor then adding tabs which are also stabilized you're running the risk of having too much stabilizer (CYA/cyanuric acid) in the pool. It will creep up and you'll eventually need to do a partial drain the refill. My opinion would be to use liquid chlorine to shock.

Next is the use of algaecide. It's true that algacides kill algae spores but that's only half the sentence. The other half is that algaecides can't kill algae faster than it can reproduce. If you want to use an algaecide I would only recommend a PolyQuat 60. Many others have copper or are metal based and you may end up having metal stains.

You can also adjust your salinity before closing. It's not mandatory but it's one less step to do during Spring opening.

I would get the pH down to around 7.0, shock with liquid and use a PolyQuat. It seems through the question that you have everything in order.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Closing/Winterize A Pool" category. Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.









Robert

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Oct 21, 2016
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Cyanuric acid at pool closing
by: Darryl

Getting ready to close above-ground pool (Oct 20). Test shows cyanuric acid over 200; it has been somewhat high since mid-september but all other chem readings ok.

I know I need to drain & replace water, but can I close the pool & deal with the problem when I open in the spring. I drain about 1/3 of the water when closing.

Hi Darryl. I always advise pool owners to try to have all of the chemical readings correct when closing. In your situation you know that about 90% of the water will need to be drained so whether you do it now or in the Spring doesn't matter, just get the CYA to 30 ppm.

You'll need to increase the FC to about 20 ppm for it to be effective because the effectiveness of the FC is partially dependent upon the CYA range. The higher the CYA the more FC is needed.

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