My Stenner pump and the change to 6% bleach vs 8.25%

[rphpool]

I thought it was going to be a simple fix to the decreased bleach % we are seeing produced. I was just going to increase my Stenner pump time by 2.25%. Well it is not quite that simple I found out. This time of year I would run for 40 min/ day ( 8500 gallon ), now I am up to 50 min/day and still not hitting my 6 ppm ( at 3ppm now , cya=50 ). I am going to give it a few days and bump up another 5 min. ( yes been following pool math ). I have been searching the internet everywhere and can not find a valid reason for the % bleach at retail big box stores going down, except for maybe $$$.

 

[IceShadow]

Older or stored incorrectly by the stores?

 

[mknauss]

I have been searching the internet everywhere and can not find a valid reason for the % bleach at retail big box stores going down, except for maybe $$$.

99.99% of the consumers of household bleach have no idea what concentration the bleach is they are buying. Why wouldn't a manufacturer just lower the % and charge the same price? They then added 'fabric protection' and called it 'new and improved'!

 

[JohnT]

Your math is wrong . You’d need to increase run time by about 27% since 6% bleach has 27% less chlorine than 8.25% does.

40*1.273=about 51 minutes.

 

[IceShadow]

Your math is wrong . You’d need to increase run time by about 27% since 6% bleach has 27% less chlorine than 8.25% does.

40*1.273=about 51 minutes.

This.

 

[Steve_in_C]

Increase old Stenner run time by 8.25/6=1.375 Increase time by 37.5% (X 1.375). Old time=40 min. New pump run time = 55 min.

 

[rphpool]

That is the run time I have set now (51 min). I will give it a day and see what happens. Thanks everyone!