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Onyx 15mm electrolytic scale reducer

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Onyx 15mm electrolytic scale reducer

Onyx 15mm electrolytic scale reducer, a maintenance-free, WRAS-approved inline fitting that helps prevent limescale build-up in whole-house plumbing.

At a glance

Manufacturer part no.
ONYX15
Showing prices

£9.36

£7.80 ex. VAT · VAT at 20%

In stock
Cut-off passed — dispatches next working day
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Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Onyx 15mm Electrolytic Scale Reducer is an inline fitting that helps prevent limescale build-up in a home's water system. It works electrolytically, releasing a small trace of zinc into the water that bonds with dissolved calcium ions so they are less likely to form hard scale deposits.

Signs this part needs replacing

  • Visible limescale build-up on taps, showerheads or shower screens
  • Reduced water flow or pressure over time
  • White scale deposits appearing in kettles or on heating elements
  • Appliances (kettles, washing machines, boilers) scaling up faster than expected in a hard water area

Before you order

  • Confirm the fitting point is 15mm pipework
  • Isolate the water supply before installation
  • Fit in line with the manufacturer's recommended flow direction and location

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.