What is the diameter of the pipe for micro-controlled oxygenation in crab ponds? How many meters are the pipes apart? How much does one meter of pipe cost?

Microporous aeration tubes are available for crab pond farming.

As for the hole diameter, 16*10 models are commonly used, priced at 1 yuan to 3 yuan/meter (market price)

The newly promoted models include 25*13 models or 20*13 models, priced at 3 yuan/meter to 10 yuan/meter (different manufacturers have different quality)