As much dirt accumulates in the filter, it is more difficult to force the water through the sand. T

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Do you have these reasons for choosing a small sand filter (available for as little more than 100 ), then maybe you can not deal with the settings of the valve.
Depending on the version, the valve 4 or 6 positions. It connects depending on the position the connections of the system in different ways: the output of the pump inlet into the basin inlet in the sand tank top sequence in the sand container filter cartridge below the dirty water through the hose drain into the sewer or septic tank
The normal mode filters. Here, the intake of the pump, water is pumped filter cartridge through the sand, as the screens out the dirt. In the run-then passes the cleaned water.
As much dirt accumulates in the filter, it is more difficult to force the water through the sand. The pressure on the gauge then increases markedly on the normal level, to maybe 0.9 or 1 bar. Then or after about a week you should clean the filter. To clean the sand filter
To do this make the pump from the valve to backwash filters (eng. Backwash) and turn the pump back on. Now, the water flow is reversed, so the water pushes from below against the sand, which dissolves the dirt and is flushed through the drainage. After 20-30 seconds, or who