An in Depth Overview of our Dualflo Harvey Water Softeners from Design Time

Dualflo from Harvey Water Softeners

Design Time is now an approved installer of all Harvey Water Softeners DualFlo™ products.

Dualflo from Harvey Water Softeners

The Dualflo Water Softener are designed and manufactured by the UK’s leading domestic water softener company, Harvey Water Softeners.

Harvey Water Softeners Product Range and SpecificationsThe Big Blue (1”) Tablet Salt Water Softener

  • The Dualflo (3/4″) Block Salt Water Softener
    • 2 bathrooms
    • 50 L/Min
    • Block salt
  • The Dualflo (3/4”) Tablet Salt Water Softener
    • 2 bathrooms
    • 50 L/Min
    • Table salt
  • The Dualflo Aquamax (1”) Water Softener
    • 3 + bathrooms
    • 80 L/Min
    • Table or block salt
  • The Big Blue (1”) Tablet Salt Water Softener
    • 4 + bathrooms
    • 80 L/Min
    • Tablet Salt
    • Light Commercial Properties

WRAS approved product

Know Benefits of Water Softeners

A water softener removes all of the Calcium and Magnesium, and are very effective in:

  • Prevents scale in the hot water system and around taps
  • Removes existing scale
  • Reduces boiler fuel cost and heating system maintenance costs
  • Prevents soap scum, which is most evident around your bath and sink
  • Improving the texture of laundry by preventing detergent scum deposits within the fibres of clothes, bedding, etc
  • Reduces soap and detergent costs. Also, bathing in softened water is a more pleasurable experience and can improve hair and skin condition
  • WRAS approved
  • Made in Britain
  • Cheaper bills
  • Shinier homes (no more limescale)
  • Less time cleaning
  • Better tasting tea, coffee and tap water
  • Softer skin and hair
  • Environmentally friendly reducing the use of single use plastic bottles to Zero.

How Does a Water Softener Work?

Water softeners are designed to remove the minerals, Calcium and Magnesium that cause scale and scum. So, they are intended to treat the whole house water supply. They are most often installed close to the point where the water supply enters the premises.

Water softeners have been used since 1903 to prevent scale in boilers, so the technology is well understood and their performance is predictable and reliable.

More, they are using a process called ‘Ion Exchange’, whereby resin made of tiny polymeric beads could trap all Calcium and Magnesium. Which are often considered the main cause of scale and scum in hard water. Furthermore, as water passes through the resin the Calcium and Magnesium Ions swap places with the Sodium Ions in the resin.

Sodium salts, unlike Calcium and Magnesium, are considered highly solvable, so Sodium does not tend to cause scale or scum. When all the Sodium Ions have been exchanged for Calcium or Magnesium, the resin must be regenerated by recharging it with Sodium Ions. This is most often achieved by flushing the resin with a typical salt solution (brine).

Water softeners can come in many varied shapes and sizes to help accommodate your typical requirements

All our water softeners come with a tank that holds resin, where the water is softened and another tank which helps to store and dissolve the salt for the regenerating brine.

All water softeners regenerate automatically. There are various ways in which water softeners determine when to regenerate. Some could be fitted with a timer and others might use a pre-set volume of water as a trigger to decide when it should start to regenerating the brine.


Why is a separate tap to provide unsoftened water recommended?

• Some people prefer the taste of hard water
• Instances where softened water isn’t suitable i.e. when mixing it with baby food
• Some fish may require hard water in their tanks. If in doubt, please get advice from your pet supplier.
• For watering indoor plants or your garden it is often recommended to use hard water which has not been stripped of any dissolved solids or minerals such as nitrates, which might be present in your local water supply. Your local authority should be able to advise you as to the water quality in your area.
• Some irons may be self-descaling and therefore designed for use with hard water, check the instructions to be sure. Nevertheless, you can still use softened water in them as it will even further extend their life span.

How much Sodium is added to the water from a Dualflo Water Softener?

For every 100 mg/L of Calcium Carbonate hardness taken out of the water, 46 mg/L of Sodium goes in. Add this to the level of Sodium already present in the water. To check this, call the customer service number of your local water supplier or local authority and you will be able to calculate the total Sodium level after softening has been done.

Why is it considered that softened water could be detrimental to health?

Due to the Sodium level, which as discussed above is not an issue.

What do the regulations say?

WRAS state that “water that has been softened on site should only be used for drinking purposes when the treated water is wholesome”, this applies to where the water hardness is particularly high and exceeds 400 ppm. Other than that, softened water would be considered ‘wholesome’ by WRAS. In this context, wholesome means healthy and drinkable.

More in Depth Resources

Made in Britain