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DNNS,
thanks for the information. I put the plants only less than one month ago. They seem to grow quite fast. I hope it won't be long before I have sufficient quantity to have any impact on water quality.
Werner,
I did'nt put the plants in the main pond. I put them in a small side pond through which the water returns to the main pond from the filter. So this way the koi cannot reach the plant at all. I didn't know about its origin. I thought it is native to my country! As we can find this almost anywhere here - in the drain, in natural lake, in rivers etc. Of cource we can also buy from plant shops very cheaply.
DickB,
thanks for the precautionary words. Yes I disinfected them, by soaking in chlorinated water for several minutes, before putting in the pond.
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