Sand Separators & Screens
The cheapest insurance policy you'll ever put on a pump.
The technology explained.
Hydrocyclone separators and self-cleaning screens are mechanical first-line barriers. The hydrocyclone uses tangential inlet flow to spin heavier particles outward by centrifugal force; the self-cleaning screen carries a fine mesh that back-flushes automatically when differential pressure crosses a threshold. Both are passive in chemistry and minimal in power.
- Removes approximately 98% of particles larger than ~74 µm from borehole, river and dam intakes.
- Protects pumps, valves, fittings and downstream media beds from abrasive damage.
- Removes leaves, fibrous debris and biological mats from open-water intakes.
- Operates continuously with automatic flush — no consumables, no operator intervention.
- Borehole intakes where the screen draws sand or silt during pump start-up.
- River, dam and storm-water intakes where organic debris and grit are seasonal.
- Irrigation feed lines protecting drip emitters and pop-up heads.
- First-stage protection for every downstream membrane, media bed and dosing skid.
- ×Not a barrier against dissolved contaminants (salts, hardness, heavy metals, organics).
- ×Not a fine-particulate stage — sub-micron solids and colloids pass straight through.
- ×Not a disinfection step — bacteria and viruses are unaffected.
- ×Without correct sizing for the feed flow, particles bypass the cyclone or blind the screen prematurely.
Where Sand Separators & Screens is used.
- Borehole grit removal
- River-intake pre-screening
- Pre-protection of pumps, valves and membranes
- Irrigation feed screening
How HidroVerse deploys Sand Separators & Screens.
We specify a separator or self-cleaning screen as the first stage of nearly every borehole, river or storm-fed train. The technology is cheap to install, consumes nothing in operation and pays for itself many times over by extending the life of every component downstream of it. Sizing is led by the feed flow, the expected particle distribution and the pressure budget — not by a single-line catalogue selection.
A typical Sand Separators & Screens treatment chain.
Separators and screens are always a first-stage protection layer — never a treatment in their own right.
Pre-treatment
Inlet piping, isolation valving and a flow-conditioning section ahead of the cyclone or screen so the device sees the flow it was sized for.
Core stage
Hydrocyclone (heavy fraction) or self-cleaning screen (organic and fibrous fraction). On dirty river or storm intakes we routinely deploy both in series.
Post-treatment
The full purification train downstream — clarification, media, membranes, disinfection. The separator buys their life, it does not replace any of them.
Waste handling
Cyclone purge and screen back-flush volumes are routed to a controlled discharge — pond, sediment trap or back to head of works for re-treatment.
Buyer's guide.
The questions every commercial buyer should put on the table before signing for a water system. Can't see yours? Send us a brief — a HidroVerse specialist replies within one business day.
A sand separator is a hydrocyclone vessel that uses tangential inlet flow to spin heavier particles outward by centrifugal force. The cleaned water exits the top; grit and sand collect in a purge chamber at the base and are flushed automatically. It removes approximately 98% of particles larger than about 74 µm in a single pass.
A self-cleaning screen carries a fine stainless mesh that filters water as it passes through. When differential pressure crosses a threshold, the screen is back-flushed automatically — typically taking under a minute and using a fraction of the treated water. Screens handle organic and fibrous debris that hydrocyclones cannot — leaves, algal mats, fine biological load — and can be specified down to single-digit micron screens.
Hydrocyclones: practically, particles above 50–100 µm; high-efficiency above ~74 µm. Screens: as fine as 10 µm with the right mesh, more typically 100–200 µm on raw water intakes.
Hydrocyclone: no power, no chemistry, no consumables — just feed pressure to drive the swirl. Self-cleaning screen: a small motor for the back-flush mechanism; no chemistry; no consumables apart from occasional mesh replacement.
That is the whole point. A well-sized separator or screen as the first stage of a train extends the life of pumps, valves and downstream media or membranes substantially. The cost is recovered many times over the life of the install.
Always first. It is the stage that protects everything downstream of it. We never place fine filtration, membrane or dosing equipment upstream of a separator or screen.
Yes — that is one of the most common applications. The separator catches sand pulses during pump start-up before they reach the pressure tank, the booster set or downstream equipment.
Hydrocyclones: periodic visual inspection of the purge chamber and confirming the auto-purge timer; very low maintenance overall. Screens: scheduled mesh inspection, gearbox grease intervals — included in the standard service contract.
Cyclone: usually 0.4–0.6 bar at design flow. Screen: 0.1–0.3 bar clean; rising until back-flush is triggered. The design pack includes the pressure budget across every component.
Whenever the feed carries both grit and organic debris — river intakes, dam intakes, storm-water sources. The cyclone takes the heavy fraction; the screen takes the fibrous and organic fraction. They complement each other rather than overlap.