Calcite Filter are used when water has a low pH (less than 6.8 pH) and is causing corrosion problems. Low pH water is called Acid Water.
Calcite Filters contain a large amount of Calcite Marble (calcium). Calcium is one of the pH buffers that control the behaviour of the pH in water. The acid water flows through the calcite marble, and dissolves the quantity of calcium required, in order to balance the pH back to 7 or slightly above. This in turn, then stops the water from being acidic / aggressive.
The filter need to be large enough to offer the water enough contact time with the calcite for it to raise the pH.
There are different size calcite filter for different applications. We have a standard size however this may vary once we understand the specific job at hand. Defining parameters are:
- How low is the pH
- How many people are in the house
- How many bathrooms / water outlets etc
- In commercial situations, what would the peak flow be at any given time in comparison to how low the pH is at the point of use.
Do we need to use other equipment in conjunction with a Calcite Filter?
- A post sediment filter can be applied after the Calcite Filter to catch any slight dust at start up.
However, in saying that, we are the only company that are supplying Calcite Filters with a
back wash Multiport Valve that allows us to backwash (flush) the slight dust/fines from
the filter on start up and at top up intervals.
Therefore, most installations don't need the post filter but it doesn't hurt to have it for support.
- pH test strips are necessary to periodically check the pH of the water at the point of use.
If the pH drops below 6.8 it's time to add more calcite to the filter.
These intervals are determined by volume usage and how low the pH was to begin with.
General house applications may need to be topped up once or twice a year.