Just to add to this topic
I called my mate Tom who sprays water weeds in the Bankstown and Liverpool council areas, asked if he had come across any spots lately.
Tom gave me a few places to go and look but all where dead, any way while doing three point turn down some dirt road in suburbia i found some weed identical to what I used to use, it really fine green hair weed in fresh water.
Dose it matter if I'm using fresh water green hair weed its it the same as what you collect at the shore line in the rock pools to catch black fish?
dogbox