Roof mix

[Andy Hinson]

Its easier for me to go to job with SH in tank. 125 gallon tank so it would never be more than a 1/3 full and its never been a problem. BUT. If you were mixing in small containers with small openings that would not be the safe way to mix

 

[Ralph Q]

In this link by AC he shows to add water first when filling the tank.

Doesn't that mean carrying 30-50% more weight? IDK.

 

[Diamond Jim]

I've read that SH has a specific weight (compared to water) for the difference %'s. I still haven't found anything concrete (no pun intended), but this seems to me to be a way to determine what % of SH you're buying.

I buy bleach in 15 gallon deldrums from a chem company with the weight and % printed on the purchase order 120 lb per deldrum . and 12% is always printed on the label . If a deldrum has been sitting more than 2 weeks the strength has decreased . We have a 900 lb limit before you need a hazmat issue.

 

["Red"]

I buy bleach in 15 gallon deldrums from a chem company with the weight and % printed on the purchase order 120 lb per deldrum . and 12% is always printed on the label . If a deldrum has been sitting more than 2 weeks the strength has decreased . We have a 900 lb limit before you need a hazmat issue.

I haven't confirmed this with any legitimate sources yet, but 12.5% should be around 10 lbs per gallon. That drum should be weighing in at around 150 lbs.

 

[Apple Roof Cleaning]

You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.

It is a good habit, for some kinds of chemicals. However, we have been adding water to sodium hypochlorite for over 20 years, with never any problems of any kind.

 

[Apple Roof Cleaning]

You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.

I was getting my SH first then diluting later at the job. I deffenitly will change that bad habit.

We have been adding water to sodium hypochlorite for over 20 years, with never any problems of any kind.
Russ Johnson is correct, it is always good practice to add some chemicals TO water. However, most roof cleaners I know, including us, have been adding water to sodium hypochlorite for many years.

 

[Diamond Jim]

One of the main issues of adding chemicals to water instead of water to chemicals is safety .Adding water to chemicals splashes the chems back at you. Adding chems to water splashes water back at you. Chemistry 101....

 

[Diamond Jim]

I haven't confirmed this with any legitimate sources yet, but 12.5% should be around 10 lbs per gallon. That drum should be weighing in at around 150 lbs.[/

Ben buying 120 pound 15 gallon deldrums for 20 years 8 pounds a gallon . I can't go over 900 lbs so I buy 6 to 7 at a time . They will not sell me 8. Because of the 900 limit is strictly enforced.

 

[Apple Roof Cleaning]

You always add chemicals to water. Some chemicals are exothermic, and release heat when water is added, sometimes rapidly and violently, causing gushing and boil overs. It's just a really good habit to adopt.

One of the main issues of adding chemicals to water instead of water to chemicals is safety .Adding water to chemicals splashes the chems back at you. Adding chems to water splashes water back at you. Chemistry 101....

Absolutely correct!
Our dedicated to roof cleaning trucks have dual 300 gallon tanks, one for tile roofs, and one for shingle roofs.
We will fill one with 80 to 100 gallons of sodium hypochlorite, and one with 110 to 130 gallons of SH, for the tile roofs.
Then, we fill them up the rest of the way, with water. But we use garden hoses in our tanks, stuck down into the chemical, so splashing water/chemical is never a problem.