Dimensional specifications, pressure classes and engineered jointing for specialized infrastructure service.
Irrigation Filtration
Which filter for which water?
Drippers have very fine passages and clog quickly without good filtration. For sandy well water, a hydrocyclone removes heavy particles before the main filter. A disc filter holds the organic matter and algae of pond and river water better, and a screen filter is simpler for mineral particles and fairly clean water.
On large systems, an automatic filter cleans itself without stopping irrigation. Filter size is chosen by the total block flow, and the mesh is set by the dripper or drip tape maker.
Laying out a filter station
With sandy water, the hydrocyclone goes first to separate heavy particles, and a disc or screen filter after it catches the finer ones. If you fertigate, the venturi is fitted before the main filter so fertiliser particles are caught as well.
Fit a pressure gauge before and after the filter; when the difference between them grows, the filter needs cleaning. Do not choose a filter smaller than the main pipe, because the pressure loss and the cleaning frequency both rise.
Cleaning and maintaining an irrigation filter
Clean a disc filter by opening it and rinsing the discs under water, and a screen filter with a soft brush; replace a torn or deformed screen, because particles pass through it. Empty the hydrocyclone's collection tank regularly.
An automatic filter cleans itself, but its valves and controller should be checked at the start of the season. At the end of the season, open the filters, wash them and keep them dry so no algae or scale is left inside.
Irrigation Filtration — Frequently Asked Questions
Disc or screen filter?
Disc for organic matter and algae, screen for mineral particles and fairly clean water.
When is a hydrocyclone needed?
For well water carrying sand, before the main filter.
How is the filter size chosen?
By the total flow of the irrigation block.
Is a disc or a screen filter better?
Disc for water with algae and organic matter, screen for mineral particles and fairly clean water; sandy water needs a hydrocyclone ahead of either.
When should the filter be cleaned?
When the pressure difference across the filter has grown; two pressure gauges show it.
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