Explore Optometry. Home / Education / Admissions / Explore Optometry. A Doctor of Optometry (OD) is an independent, primary health care provider who examines the visual system, the eye and associated structures, as well as diagnoses, treats and manages related diseases and disorders. Optometry involves much more than prescribing and fitting glasses and contact lenses.
In most of the UK, when hard water is softened with water softener, the softened water is likely to comply with the Drinking Water Regulations, assuming that the concentration of sodium does not exceed 200 mg/l, it would be regarded as wholesome and therefore considered safe to drink over the long term.n most of the UK, when hard water is softened with water softener, the softened water is likely to comply with the Drinking Water Regulations, assuming that the concentration of sodium does not exceed 200 mg/l, it would be regarded as wholesome and therefore considered safe to drink over the long term.
A filter will not remove dissolved solids (which are responsible for hard water). A descaler, (Salt Free Softener) does not remove dissolved solids, it prevent the solids from being deposited inside pipes, on fixtures, etc.. A water softener is a true water treatment system. The dissolved calcium and magnesium carbonate (which are responsible for the hard water) in the water are replaced with either sodium chloride (salt) or potassium chloride.