# Thread: Rising water temperature: Chlorine Usage.

1. ## Rising water temperature: Chlorine Usage.

Sunlight uses up more chlorine when the water is warm than it does when the water is colder.

I know this to be true but I don't have a firm understanding of the reason. I read one thread that said the warmer water basically creates a better environment for algae to grow but that it really doesn't cause more chrlorine use. This seems contradictory because basically it does cause more chlorine use, if only to fight the more present algae.

Also, why does the pool calculator not account for temperature when using free chlorine figures? I can try and raise my FC by 2 at 50F and at 100F and the same amount of chlorine is needed according to the calculator. I suppose the answer will be: because the water temp, doesn't effect chlorine consumption, while in reality it really does, it effects it drastically in my experience.

2. ## Re: Rising water temperature: Chlorine Usage.

The pool calculator does not care how much chlorine, that is your job. All the calculator does is calculates how much concentration change you can expect from a known addition added to a known pool size.

If you find that you need more chlorine, then you need to adjust how often or how much chlorine you put in your pool.

3. ## Re: Rising water temperature: Chlorine Usage.

Originally Posted by linen
The pool calculator does not care how much chlorine, that is your job.
The pool calculator calculates how much chlorine, that is what it is for.

4. ## Re: Rising water temperature: Chlorine Usage.

I should clarify, it does not care how much chlorine your pool is using. Sorry about that

The calculator is dumb, you tell it how much you have and you tell it where you want it to go, it calculates how much chlorine to put in.

5. ## Re: Rising water temperature: Chlorine Usage.

Originally Posted by linen
The calculator is dumb
Now you're going to offend Jason! :P

JK, but seriously it doesn't care how much chlorine. It calculates the difference. I think most people understand that and this conversion doesn't really answer the temperature to usage ratio.

My chlorine usage doesn't appear to change with the temperature, but it does change with the amount of sunlight (which makes it warmer).

EDIT: Just realized I answered a question from a user who has an anti-speedo avatar.
I feel the same way though. I only wear the speedo by myself and with my fiance, because it's like underwear
Under normal circumstances I wouldn't want to be seen or see any other dudes with one on. Or maybe it means beware is in, bikini guys ahead!

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•