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We want to help you make informed
decisions before you buy. We do not promote one brand or product. We
want to educate and inform the general public of the large
selection of swimming pool supplies available to them today. Years
ago swimming pool owners did not have as many options available.
 Find swimming pool terms and their meanings here:
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HtH
Trade Mark of a worldwide supplier of water treatment
chemicals, most notably Calcium Hypochlorite. We sell
Calcium Hypochlorite sourced from a variety of manufacturers
under its chemical name.
Hard Water
When rainwater passes through rocks such as chalk and
limestone, a certain quantity of mineral salts such as
Calcium and Magnesium Carbonate dissolve into it. These
hardness's salts are then carried into the mains water
supply. Most commonly these are expressed as p.p.m. of
Calcium Carbonate. Anything in excess of 250 p.p.m. is
considered hard. If you live in the South of England on
Chalk or in the Pennines on Limestone then your water will
be very hard, in excess of 500 p.p.m. If you have hard water
you will have noted "furring" of kettle elements and may
have fitted a water softener to avoid problems with boilers
and dishwashers. In pool and spa water, some hardness is
desirable as it prevents corrosion of pool surfaces and
stops tiling grout dissolving into the water. If on the
other hand it is too hard, then scaling will result. This is
unsightly at best and can cause damage to boilers at worst.
Halogen
The group of elements comprising chlorine, bromine, iodine
and fluorine. Of these, chlorine and bromine are used to
sanities pool and spa waters.
Hypobromous Acid
When BCDMH is used to sanities a pool or spa bath water, it
provides bromine in the form of hypobromous acid.
Hypobromous acid combines with nitrogen compounds from
bathers to produces bromamines. Unlike chloramines, there is
no irritating odor associated with bromamines. The
hypobromous acid can be regenerated by shock treatment with
OXYGEN SHOCK.
Hypochlorite Ion
If the water pH is too high, hypochlorous acid disassociates
into a hydrogen ion (H+) and a hypochlorite ion (OCl-). If
the pH is too low, chlorine is evolved which will result in
irritation to bathers. Due to its negative charge,
hypochlorite ions are repelled from the cells walls of the
micro-organism they are trying to penetrate. In consequence
hypochlorite ions are very poor sanitizers by comparison to
hypochlorous acid.
Hypochlorous Acid
When a chlorine donor dissolves in water, hypochlorous acid
is formed and it is this compound which sanitises the pool
water.
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