PH has important effects on water quality, aquatic life and fish.  The general requirements of pH value in 7.5 ~ 8.5, slightly alkaline, so beneficial to fish and other aquatic organisms, the water environment.  

■When the pH value fluctuates, the charged state of colloid in water will be affected, leading to the adsorption or release of some ions in water, thus affecting the content of effective nutrients in the pool water and the effect of inorganic fertilizer application.  

■ If pH value is low, phosphate fertilizer is easy to permanent failure;  Too high, temporary failure.  

■ When the pH value is higher, the proportion of ammonia is larger, the toxicity is stronger;  The lower the pH value is, the sulfide mostly becomes hydrogen sulfide and is extremely toxic.  When the pH value is too low, bacteria, most algae and zooplankton are affected, the nitrification process is inhibited, photosynthesis is weakened, and the material circulation intensity of water body decreases.  

Too high or too low pH can cause fish metabolism to decline, blood affinity for oxygen decreased (acidic), food intake, low digestibility, and inhibited growth.  When eggs hatch, the pH value is too high (about 10), egg membrane and embryo body can automatically disintegrate;  Too low (about 6.5) embryos are mostly malformed.  

Natural water has a buffer effect on pH value and is generally stable.  The pH value fluctuated or changed greatly in pond intensive culture and special condition.  

Such as deep pond silt, water hypoxia, pH value is often low or too low;  

 In summer, the weather is sunny, the light is strong, the water is fertile, the phytoplankton quantity is large, the photosynthesis is strong, in a short time, the pH value rises very high;  

 Or water by different nature, different degrees of pollution, pH value is too high or too low.  

The method of adjusting pH value:  

Usually is to remove too much silt, combined with the use of quicklime to clear the pond, when the pool water is acidic (when pH < 7) splashing 10% quicklime water (every 667 square meters of water, water depth of 1 m, 1.5 m, 2 m respectively with 20kg quicklime, 25kg and 30kg);  

Often add oxygen to the pool water, especially in the high temperature season, often agitate the upper and lower water layers;  To improve the pond environment, fertilize the pond by combining organic and inorganic fertilizers.  Avoid the use of different degrees of pollution of water, water, etc.  

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