The Roof Cleaning Institute Of America Training & Certification Forum
"Find A Certified Roof Cleaner Directory"

Nothing wrong with 16% just cut It down accordingly to the percentages you need. I never try to rinse moss the moss off prematurely. Most customers will understand it takes time for the roots to break down for the moss to release completely. Usually a few good rains will do the trick. If you go the route of leaving it to mother nature, touch base with your customers or swing by to inspect the roof periodically. A new customer can feel abandoned if they aren't familiar with the process and still see moss on the roof... Even if it is dead and just waiting to blow off.

I understand the same thing. Straight from the supplier. SH is 15 when brand new. If older it goes below 12.5. It "averages" 12.5.

can  you  get 12.5 cheaper? I  my  self use 15%  but im  sure after it sits a week in  warhouse its 12.5 from what  manufactor told me .....

where are you  getting  your SH ?