EM mud balls for ponds - do they work?
By Casat26
Mid Glamorgan,
United Kingdom 
I recently noticed a gardening catalogue selling 'EM mud balls', which reputedly clear pond water of green algae and are safe for fish and other wildlife. Before investing in some, I wonder whether anyone has tried them and was it with any success?
2 Jun, 2009
Answers
What about barley straw? thats supposed to keep ponds clean. Think most garden centres that have aquatic areas will stock it. Not too expensive either.
2 Jun, 2009
never heard of them. with the right amount of plants the pond will clear naturally.
aim for about 2/3 of the surface covered with growth.
2 Jun, 2009