The web page for Piscines Apollo indicates they won't ship their borate test to the US. I know the lamotte test strip could be used, but I'd like to use a drop based version if possible. It seems like it could be replicated with mannitol and Bromthymol blue. Does anyone have a suggestion for where to obtain these reagents in the USA? Do they have specific concentrations? Is the amount of mannitol critical (spoon size)?