Liquid Chlorine (Sodium Hypochlorite) vs Trichlore Tablets

[stefanos]

Hi, I add my CYA a when I opened my pool, but due to a heatwave most of this year I have been using a lot of Trichlore Tablets, so I am backwashing to compensate/remove the added CYA in the tablets.
I read that Liquid Chlorine is cheaper however I cannot find any calculations to compare the two options.

If my pool chemical supplier quoted Liquid Chlorine (12%) 1$ per liter (3.78$ / gal) and 5$ per Kg (2.27$ / lb) for Trichlore Tablets.
How do you compare the 2 options? I would love to see the calculations or at least a comparison (i.e. 1L liquid = 100g Tablet)

Any help would be much appreciated.

 

[BoringDamo]

Take a look at the effects of adding in PoolMath. It will show you how much FC will rise by for a given amount of liquid chlorine / trichlor tablet. You can then use the price to work out how much FC / $ you are getting with each.

You are clearly aware of the FC / CYA ratio needed but generally everybody here uses liquid chlorine due to the issues of rising cya with trichlor (if you are doing a cost comparison don’t forget to include cost of water required to refill the pool when you need to drain because of high cya from trichlor).

 

[nobody291]

I am backwashing to compensate/remove the added CYA in the tablets.

Just to make sure you know, backwashing won't remove CYA in any significant amount, only draining and refilling will reduce CYA.

 

[ajw22]

You can get the methodology from these older posts and update it for your costs...

Cost Comparison of Chlorine Sources

I originally posted the following on another forum (I thought I also posted it here, but can't find it). First, I describe exactly what is in chlorinating liquid and bleach as far as we know. I'll use 12.5% chlorinating liquid as an example. This link is a typical example. Though they do not...

www.troublefreepool.com

How to calculate cost per effective chlorine liquid v powder

Q: How do 'you' calculate the cost per effective chlorine between liquid versus powder? Apparently this is the calculation to get price per available chlorine: a) liquid chlorine: $cost/gallon x 1gallon/9.7pounds x 1/10.8% by wt available chlorine b) liquid bleach: $cost/gallon x...

www.troublefreepool.com

 

[stefanos]

Thanks this was very helpful information for me. It confirms what I thought that the liquid is more expensive, however looking at the CYA my backwash is only dumping about 1.5ppm per week but my triclore is inc. about 6ppm/week. I will have to reconsider my pool chemicals strategy for next year. Stephen