It is noteworthy that the calcium hardness of water
increased close to 500 mg [L.sup.-1] CaC[O.sub.3] in the present work, more than three times higher than the upper suitable limit for aquaculture (BOYD; TUCKER, 1998).
So, the hardness of water
may be one of the characteristics of processing water that should be monitored by poultry processors.
The hardness of water
for commercially available drinking water samples varied from very soft to hard (2.61 mg/l to 169.13 mg/l).
Boiler water treatment formulation can be made from these dyes to remove hardness of water
. Similarly, during application of dyes on fibers, EDTA, NTA and Calgon are added as sequestrants, while using these dyes these chemicals will not be added.
When the hardness of water
is lower than alkalinity its pH may increase very much at the end of afternoon due to the lack of CaC[O.sub.3] precipitation.
The Total Hardness of water
is due to presence of cations, [Ca.sup.2+], [Mg.sup.2+], [Fe.sup.2+], [Mn.sup.2+] and anions, HC[O3.sup.-], S[O4.sup.2-], [Cl.sup.-].
CORRELATIONS BETWEEN CALCIUM, MAGNESIUM AND HARDNESS OF WATER
IN THE DRINKING WATERS OF DECATUR COUNTY GEORGIA AND THE INCIDENCE OF CARDIOVASCULAR AND CEREBROVASCULAR DISEASES, Abe A.
Severn Trent's price hike, announced last night, also includes pounds 15 million for tackling nitrates in Warwickshire's water, pounds 19 million improving the taste, odour and hardness of water
in the county, pounds 4.5 million on sewer flooding, and pounds 30 million on renewing and maintaining water mains in the county.
Hardness of water
is caused by the presence of multivalent metallic cations and is largely due to calcium, Ca++, and magnesium, Mg++ ions.
Hardness of water
may be due to high amounts of Ca, Mg and Fe.
First two salts are the source of temporary hardness of water
and the last two cause the permanent hardness of water