Chlorine freshness

[Viperscorpio]

So I recently picked up some 10% strength from my local Fry's for about $3/gal, but I think it may have lost some of its strength. Someone mentioned a date code to be in the past, but I cant seem to decipher it.

Anyone know if these numbers indicate the date at all? Thanks!

 

[Mr Bruce]

December last year. 18 is the year, the number is the number of days into the year. So almost the end of last year.

Depending on how it was stored it may be still bleach.

 

[Viperscorpio]

Oh I understand now.

YY DDD and then presumably a timestamp or something. I'll have to find something fresher next time!

 

[Viperscorpio]

It has been increasing the chlorine levels, but I don't think it's effectively 10% anymore, as it's not bringing the ppm up as high as I was expecting.

 

[YippeeSkippy]

Aim for chlorine no older than 3 months, and stored properly. No buying chlorine stored in hot sunny garden center areas and such.

Maddie

 

[niteshift38]

A method I have used in the past is to use PoolMath to find out how much 10% to add to raise my FC 2ppm. After adding that amount of older chlorine, I wait about 1/2hr (with pump running on high), then test FC again to see how much the "PoolMath Recommended" amount ACTUALLY raised my FC level. I then calculate the % using that and enter that number in PoolMath until the older chlorine is gone through. Hope this helps a little. Good Luck !!!

 

[Viperscorpio]

Thanks! Good idea!