Black pit water transfer requires professional practitioners to analyze various experiences and use drugs as appropriate. I heard a friend's professional explanation. At present, there are many black pit water transfer printing products. I have been digging pits for many years and tried many manufacturers, all of which are effective. However, because the water pollution in black pits is much greater than that in aquaculture ponds, this method may not be effective next time, and there are related answers on the Internet. You can search for black holes to divert water, and a lot will come out. Why waste time answering this question here? Because you have been in contact with Yangling Ganerkun's black pit products since the early spring of 20 18, you can gain a lot just by the explanation of customer service. The products are more professional.