|
Sodium
Sodium salts are present to some degree in all natural waters. Sodium
is extremely soluble and increases its solubility as water temperature
rises. Sodium salts do not form scale when heated nor do they produce
curd when combined with soap.
High concentrations of sodium indicate there is a high total mineral
content and tend to increase the corrosive action of water. In very high
concentrations, sodium salts give water an unpleasant taste. They can
also hamper the operation of water softeners in the removal of hardness.
Reverse osmosis and deionization remove sodium from water.
Tannins
Probably one of the most difficult to treat of the water quality issues,
tannins are caused by water passing through rotten vegetable matter. The
water picks up the colour and transfers it to the water. EDS Pumps &
Plumbing Ltd has developed its own method of tannin removal. For more
information, see
Tannin Filters.
Total
Dissolved Solids (TDS)
Total dissolved solids (TDS) is the weight of solids per unit volume
of water which are in true solution.
A high TDS can indicate that there is a high concentration of sodium. A
reverse osmosis system is useful to remove a high TDS caused by high
sodium.Multi-media
filtration would be used with a high TDS caused from sediment and
suspended solids.
Turbidity
Turbidity is the measure of the amount of light absorbed by water
caused by suspended matter in the water. High turbidity does not
necessarily make the water unsafe to drink; however it may not be all
that appealing. Turbidity is caused by inorganic matter, such as clay,
rock flour and silt, and organic substances like microorganisms,
vegetable or animal matter.
Mechanical filtration
will remove almost all forms of turbidity. Generally, these filters are
installed at point-of-use rather than point-of-entry as they can cause a
serious pressure loss.
Multi-media filtration is also effective to remove turbidity
and produce a high-quality filtered water at a faster flow rate than
conventional sand filtration.
T |
