Spitz,
I use power sulfur. This lowers the ph and fungus dies and the Sans love a lower ph. Sans can go down to 5 and I don't think power sulfur goes that low. 6 is the best alround ph for Sans. I mix mine in water then use it to water all my Sans. It stops crown rot and even started to see pups starting to come up.
You can buy 'Flowers of Sulfur' or just sulfur for Rose Gardens.
Stush
