Products » Sand Dual Filters » Filter Back-washing
Over time filtration becomes less efficient and flow rate loss in the inlet may occur (or loss of load). In the automatic models, for the back-washing are used hydro-valves with a remarkable water passage and a differential pressure control box. At set time or with manual button.
Back-washing is activated in order to keep the difference between inlet pressure (dirty water) and outlet pressure (clean water) within a maximum value of 1 bar.
Back-washing is carried out in one chamber only using the liquid that has been cleaned and filtered by the second chamber.
5 - they hydro-valve shuts the dirty water inlet coming from the upper part.
6 - The water reverses its forcedly merging from the bottom to the top (upstream)
7 - Back-washing water drag to the surfaces all the residuals trapped in the grit
8 - the water saturated with dirty particles is conveyed towards a supplementary outlet.
In filters in battery the back-washing is carried out periodically and in alternative way during ordinary filtration and with the same filtered water.
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