Free Delivery On Orders Over £50

Calmag Magnetic Scale Inhibitor SI-

Code: PWAT100
  • £21.31
Item in Stock | Usually dispatched within 24 hours
Want it by Thursday 21st October? Order within 1 day, 5 hours, 3 minutes and choose 2 to 5 Day Delivery at checkout.

CalMag can be fitted onto the hot or cold water lines. It comes with compression fittings as standard and does not require earth bonding. Once the unit has been installed you can sit back and relax as it will continue to work day and night without the need for regular maintenance.

Scale Cost Money - The build up of scale on heating surfaces can increase fuel costs substantially. The scale barrier is a poor conductor of heat so reduces the efficiency of heat transfer - costing valuable energy and money.

Scale increases Time & Effort - Build up of scale on shower heads, tiled surfaces, taps. basins etc. is difficult to remove - and also unsightly


  • Economical to operate
  • Water remains potable
  • No maintenance
  • Easy to install
  • Competitive initial cost
  • Stops hard scale forming
  • No chemicals used

After Installation you should notice the following effect

1. Any hard limescale that has formed around taps, sinks etc, will begin to soften with regular contact with treated water. This will make it much easier to clean.

2. Shower heads will be become descaled over time. Initially, showerheads may become blocked with loose limescale debris (often the case with electric showers). To solve this, simply remove the shower head and rinse out the debris.

3. After several months your hot water system will gradually become more efficient. Eventually you should be able to lower the water temperature and make considerable savings over the year.

  • Length inc compression fittings is 163mm
  • Fitting - Compression
  • External Diameter - 22 mm
  • Internal Diameter (Bore) - 15mm
  • Length - 190 mm (15mm)
  • Maximum Flow Rate - 1.08 l/sec or 14 gpm
  • Maximum Working Pressure - 12 bar (168 psi)
  • Maximum Working Temperature - 100 Degre
  • Full Metal Body
  • Earth Bonding Required

Deliveries - 

Our normal delivery days are Monday to Friday excluding Bank Holidays, in most cases your item(s) will be dispatched same day providing we receive your order by 2pm excluding products marked 'Local Delivery Only'. We use reliable carriers such as the Royal Mail and DX and typically you can expect your item to arrive within 3 working days. However on rare occasions your delivery may take longer due to factors beyond our control.

Return within 14 days.

Returns Address - 

Trade Supplies Online

1 Standard Way


North Yorks



Refunds –

If you cancel your contract between us within the seven-day cooling-off period we will process the refund due to you as soon as possible and, in any case, within 30 days of the day on which you gave us notice of cancellation. In this case, we will refund the price of the goods in full, (excluding delivery charges). However, you will be responsible for the cost of returning the item to us. Products can only be returned if packaging is not broken and is unworn/ not used.

Faulty or Damaged – 

If a product is suspected to be faulty or damaged, please contact us within 24 hours of receipt and a replacement or refund will be arranged. If a product has been fitted and/or used and is suspected to be faulty, please contact us immediately and we will resolve the issue according to the manufacturers terms and conditions.

Free Delivery on orders over £50 Ts & Cs - 

Large (ugly freight) items are currently excluded from this offer i.e. wheelbarrows, ladders and cement mixers. Deliveries to Ireland, Northern Ireland, and UK Non-Mainland are also excluded.