Knowing What Chemicals To Add & How

by Donna
(El Edorado, KS)

I have an above ground pool. I understand how to use the test kits and strips. However, after I use the test kits I still do not understand how much of each chemical is needed. I wind up guessing amounts and wind up with the chemicals unbalanced all summer.


By the end of summer my pool looks terrible. How do I figure out how much of a chemical to add if it is needed??

Thanks!




Thanks for the question Donna

Out of the nearly 1000 questions I've answered, I think this is one of the most important, and it's the first time anyone has asked this.

The easiest way to determine how much of any chemical to put in a pool is to go by the 10,000 gallon mark. I normally say you would add such & such "per 10,000 gallons". So knowing how many gallons are in the pool is the first step.

It depends on the chemical and what you're trying to accomplish. Adding soda ash will increase pH and sodium bicarb will increase both the pH and alkalinity, while muriatic acid will lower both.

Then you need to know the chemical reading, and how much you want a particular reading to increase or decrease.

If you have a 10,000 gallon pool and want to shock it, that is, bring the chlorine level up to 10ppm, you'd add 3.5 qts. of liquid chlorine. So, to increase the chlorine 5ppm, add 1.75 qts. An increase of 2.5ppm will require 0.9 qts. All you do is half the amount of chlorine.

Without taking the risk of repeating myself and for the sake of time, here are the pages you need. They have the charts on them. All you need to do is to find the gallon size of your pool. Some charts go in increments of 5,000 gallons. If your pool is around 7,000 for example, you'll use a little more than a 5,000 gallon pool but less than a 10,000 gallon pool. Adjust accordingly the amount of chemical for your size pool.

Chlorine
Swimming Pool Chlorine

Pool Shock

Pool Chlorine

Chlorine Tablets

Pool Chlorine Tablets

For every 10ppm of chlorine added with Dichlor, you'll raise the CYA by 9ppm.

For every 10ppm of chlorine added with Trichlor tabs you'll raise the CYA by 6ppm.

pH
Swimming Pool pH Levels

Pool pH

Alkalinity
Pool Alkalinity

Total Alkalinity

Muriatic Acid

Calcium Hardness

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Pool Water Testing Kits" and the "Chemical Questions" categories.

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

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Hope this helps and have a great Summer.

Robert

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No pH, Alkalinity or Stabilizer Reading

I believe there is another reason besides the pool water being too acidic when you get zero level on the pH, alkalinity and stabilizer reading.

Chlorine level showed 1 two hours after adding liquid shock. Previously, alkalinity increaser had been added (2 separate doses) and the stabilizer was added 10 days ago. Pool water is crystal clear.

Used both strip test (more than 3 times) and also Taylor Drop Test twice.

Any thoughts?




Thanks for the question

Yes it can happen that a pool owner can have 2 - 3 bad readings with the same kit. Here's what happened to a pool guy in Florida. Real pool guys can make mistakes too. Similar kind of strange event:

Step 2 Taylor Calcium Hardness, No Red

First I'd encourage you to get a Taylor K-2006 kit. It's the best. You had mentioned a Taylor Drop test was used but I don't have the specific brand.

Next is get rid of the test strips. They're convenient but don't give you accurate readings like the K-2006 kit.

Next, you can take a sample of pool water to your local pool company for analysis and compare this to your readings. Take your Taylor kit and strips in with you and do a comparison right there. This will give you the most accurate detailed data. Do the tests one after another.

It could be the strips are old or something happened to the pads during processing. The drops might be old or you may have put in the wrong drops, too many drops, not in the right order, etc...

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

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of $35 per hour 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.









Hope this helps and have a great Summer.

Robert

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