[Erns]

When I was in Japan in October I kept an eye open to their concrete ponds and how they run them, filtration etc.

One thing I noticed is that they never added clay directly to their ponds. They take a big bowl, fill it with water and then add a bunch of clay. THen they wait a day or so till the clay settles out and then they only add the clear water at the top. The sediment stays and is re-used a couple of times.

So what's your take on this? We have always been told to disolve the clay in some pond water and then add everything. The pond stays murky for a day or so but then after a few days the water goes gin clear.