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Brine Tank 100L Black


100 Litre Brine Tank for Water Softening Systems

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Brine Tanks for Water Softeners

The solution to a hard water problem is to remove the calcium and magnesium hardness. While there are chemical treatment methods that do this, the most commonly used method is a water softener.

A water softener is a mechanical water purification system that gets plumbed into your home or boiler water supply system. All water softeners use the same operating principle: They exchange the minerals for something else, in most cases sodium. The process is called ion exchange.

The heart of a water softener is a brine tank. It’s filled with small polystyrene beads, also known as softener or ion-exchange resin. The beads carry a negative charge.

Calcium and magnesium in water both carry positive charges. This means that these minerals will adhere to the softener resin as the hard water passes through the mineral tank. Sodium ions also have positive charges, albeit not as strong as the charge on the calcium and magnesium. When a very strong brine solution is flushed through a softener vessel that has ion exchange resin already saturated with calcium and magnesium, the sheer volume of the sodium ions is enough to strip the calcium and magnesium ions off the beads. Water softeners have a separate brine tank that uses common salt to create this brine solution.

In standard operation, hard water moves into the media vessel and the calcium and magnesium ions move to the resin, replacing sodium ions. The sodium ions leach into the water. Once the softener resin saturated with calcium and magnesium, the unit enters a three phase regenerating cycle. First, the backwash stage reverses water flow to flush dirt out of the tank. In the recharge stage, the concentrated sodium-rich salt solution is carried from the brine tank through the softener vessel. The sodium collects on the resin, replacing the calcium and magnesium, which go down the drain. Once this stage has been completed, the softener tank is flushed of excess brine and the brine tank is refilled.



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