Because of the high content of heavy metal ions in the cement of the newly built cement pond, if you don't take scientific de-alkalization measures to directly stock aquatic animals, there will often be a sharp rise in pH value in the aquatic water, the phenomenon of reduced dissolved oxygen content, which will cause a large number of deaths of aquatic animals. New cement pool dealkalization can be used in the following ways.

1, full of water immersion: if the new cement pool is not in a hurry to use, the cement pool can be filled with water immersion 10-15 days, every 2-3 days to change the water once.　2, calcium superphosphate method: 1 kilogram of calcium superphosphate dissolved in each cubic meter of water, soak 1-2 days.

3, glacial acetic acid method: 10% glacial acetic acid to wash the bottom and four walls of the cement pool, and then filled with water immersion 3-5 days. 4, sodium acid phosphate method: 20 grams of sodium acid phosphate dissolved in each cubic meter of water, soak for 2 days.

After the de-alkalization treatment of the cement pool, it must be cleaned with water and the pH value of the pool water must be tested, if it is within the normal range, then it is possible to breed eels.

1 day before the mass stocking of eels, first put a few eels, carefully observe their activities, to determine the absence of adverse reactions, before stocking all according to plan.