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How are the sand filters work?

Vinapool  recommends sand changes in your filter every two to three years. While non-technical sand "worsens" the particles being eroded and losing the ability to trap dirt and debris. Chemical ...

Flowchart of pool filtration technology - skimmer

 Used for swimming pool with surface area up to 250 m2. No need to use balancing tank.

Flowchart of swimming pool filtration system - overflow

Use manual drain overflow :

        Used for swimming pool with large surface area from 250 - 300 m2. A balanced tank should be used to regulate water balance

Swimming pool test

1 / Clor test with DPD # 1 reagent

Pour water into the test tube as small as the horizontal line
Put 1 DPD into the tube

Water pool and chemical composition.

Pool water and chemical composition ...
 
There is a truth that not many people notice, that the swimming pool (especially the outdoor tank) is considered one of the most polluted ...