1, quicklime
When the quicklime comes into contact with water, strong alkaline calcium hydroxide is formed, and the pH (acidity) of the pool water rises sharply to 11-12, thereby killing wild fish, predators and various pathogens. There are two ways to use clear lime ponds. First, the dry clear pond: pond water 5 cm - l0 cm, in the pond at the end of digging a number of small pits, the lime will be placed in a small pit, add water to melt, not to be cooled evenly spilled into the pool. The amount of quicklime is generally between 60 kg and 75 kg per mu, and between 50 kg and 60 kg for ponds with less sludge. On the second day after the clear pond, the pond mud must be moved with iron to fully mix the lime mud with the mud. The clear pond with water is not drained, and the fresh lime slurry is splashed. An average depth of 1 meter per acre uses 125 kg - 150 kg of quicklime. Due to the large amount of quicklime in the clear pond, splashing troubles, this method is less used in production. The key technology of quicklime clear pond is that the lime used must be block ash. Only the block ash can produce calcium oxide, which is called quicklime; and the powder ash is the combination of lime and the carbon dioxide in the air to form calcium carbonate, which is called hydrated lime. As a clear pond drug.
2, bleach, bleaching, trichloroisocyanuric acid
All of them are decomposed with water, releasing hypochlorous acid. Hypochlorous acid releases the initial ecological oxygen immediately. It has a strong effect of killing and killing enemy organisms. Bleach usually contains about 30% of available chlorine (this refers to the percentage of total chlorine with disinfecting capacity), bleach is pure hypochlorous acid, contains 60% to 70% of available chlorine, and trichloroisocyanuric acid contains available chlorine 85 %~90%.
How to use: Calculate the volume of water in the pool first. Bleach is 20g per cubic meter of water, ie 20ppm, bleach is 1/2 of bleach, and trichloroisocyanuric acid is bleacher powder. The amount of 1/3. After they were dissolved in water, they were immediately splashed. The key to the technology of bleaching ponds is to prevent their dehydration. Once the bleaching solution is deliquescent, the total available chlorine content is greatly reduced, affecting the clear pond effect. The nature of bleaching fines is relatively stable, and the nature of trichloroisocyanuric acid is the most stable. If it is kept open for half a year, the loss of available chlorine is less than 10%.
3, tea ceremony
The samovar is a round cake shaped by the remaining dregs after the oil seeds are pressed. How to use: Knock tea pods into small pieces, soak in water, and soak in water at about 25°C for a day and night. Add water when applied and spread evenly over the entire pool. The water depth of 20 centimeters per acre is 13 kilograms, and the depth of water is 35 kilograms - 45 kilograms. The above dosage may be increased or decreased depending on the type of wild fish in the pond. For fish that cannot drill mud, the amount can be less, and vice versa.
Clearing the pond with the above drugs usually takes 7 days to 10 days, and the medicinal properties disappear before the crabs or shrimps can be stocked. The medicinal properties of bleaching powders disappeared quickly, and usually crabs or shrimps were released after clear ponds for 5 days.
The above-mentioned several clear pond drugs have their advantages and disadvantages. Salamander can kill wild fish, aquatic insects, frog eggs, cockroaches, snails, grasshoppers, etc.; lime, bleach, bleach and trichloroisocyanuric acid can kill the above-mentioned enemy organisms, but also can kill aquatic plants. , filamentous algae, parasites, and pathogenic bacteria, etc., its role in the elimination of predators quickly and thoroughly. Quicklime also maintains pH stability in the water, releasing nutrients such as nitrogen, phosphorus, and potassium that are adsorbed by the sludge, improving water quality. It must be emphasized that the saline and alkaline land fish ponds have large alkaline water and high pH values. Therefore, it is not appropriate to use alkaline quicklime as a clear pond drug, but bleached powder drugs should be used. In addition, tea aphids have a strong destructive effect on fish blood, and crabs, shrimps, and other crustaceans are 50 times less sensitive to tea aphid toxin than fish. Therefore, it is common to use tea pots and clear ponds, the dose of which can only kill wild fish and other animals, while the shrimp and crabs do not work, so the tea and fish ponds have clearer and more crabs and shrimps.
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