What is a swimming pool recirculation and purification water supply system? What are the advantages and disadvantages

Your so-called 'engine room type' is also the traditional 'sand tank filtering', traditional filtering: is based on nature's water purification, filtering the water of high precision, thorough, cloth water outlet installation uniformity, filtration effect is very good, the water flow is calm, basically from the surface of the swimming pool can not see the phenomenon of water flow, the swimming pool has no hygiene dead ends, large swimming pools or rich people are using this filtration cycle, the disadvantage is that it takes a lot of time. The surface of the swimming pool can not see the phenomenon of water flow, swimming pools have no health dead ends, large swimming pools or swimming pools of rich people are used in this way of filtration and circulation, the disadvantage is that it requires a lot of piping, installation, maintenance are inconvenient, the need for a machine room, the initial investment is large. Wall-mounted, no piping, eliminating the machine room, simple installation, easy maintenance, small investment in the early stage, but poor filtration accuracy, if the swimming pool is a multilateral irregularity, there will be health dead ends in the pool, that is to say, the filtration is not complete, if the pool water is deeper, basically the bottom of the pool will be deposits, so the equipment needs to be swimming in it, stir, and a short period of time will need to be cleaned to replace the filter bag. Wall-mounted equipment for small swimming pools, wall-mounted in my eyes is to show people, and 'room type' is suitable for a variety of large and small swimming pools.