I've been using it for a long time now, and it works just fine. They do
a preservative-free version for sorting. Beats making it up yourself,
and it's cheaper than others partly because you don't have to pay
for shipping all those kilograms of water in the ready-diluted stuff!
And there's a tap with *each* container :-)
Highly recommended. I think they will send you a sample if you ask them.
--David