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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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X Y Z
( sorry no other terms found for the letters x, y or z )
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- MAGNESIUM HARDNESS A measure of the amount of
magnesium dissolved in the water. It is part of total or
water hardness. It also causes scale if levels are too
high.
MAIN DRAIN This term usually refers to a plumbing fit-
ting installed on the suction side of the pump in pools,
spas and hot tubs. Sometimes called the drain and is
located in the deepest part of the pool, spa or hot tub.
It is not a drain, such as a drain on a kitchen sink.
Main drains do not allow the water to drain to waste but
rather connect to the pump for circulation and
filtration.
MAKE-UP WATER This is sometimes called "tap" or "refill"
water. It is the water used to replace water lost to
evaporation, splash-out, leaks or swimmer drag-out in
the pool.
MANIFOLD The branch pipe arrangement that connects
several input pipes into one chamber or one chamber into
several output pipes. A filter manifold connects several
input pipes from the filter septa back into one common
pipe.
MARCITE Originally a brand name for a white plaster
finish coat from 1/8th to 1/2 inch thick applied over
the gunite or shot Crete.
MICRON A unit of length equal to 1 millionth of a meter
- it is .000394 of an inch. Microns are used to describe
the pore size of filter media. Sand filters have
openings of 25 to 30 microns; cartridge filters have
openings of 8 to 10 microns; and D.E. (diatomaceous
earth) filters have openings of 1 to 5 microns. Humans,
without magnification, can see objects 35 microns or
larger. A granule of table salt is between 90 to 110
microns.
MINERAL Any substance that is neither animal or
vegetable. It is any class of substances occurring in
nature, usually comprising of inorganic substances, such
as quartz or feld- spar, of definite chemical
composition and definite crystal structure. It sometimes
includes rocks formed by these substances. Ground water
dissolves these rock substances, and the dissolved
minerals are present in tap water. Depending on the
kinds of rocks the water comes in contact with, the
minerals dissolved in the water may be just a few or
they may be many. Water hardness is mostly comprised of
these minerals.
MULTIPORT VALVE Also called a rotary-type backwash valve
- This valve replaces as many as 6 regular gate valves.
Water from the pump can be diverted for various
functions by merely turning the valve handle. The water
may be sent to waste, used for backwashing, bypassing
the filter for maximum circulation, for normal
filtration, filtering to waste (rinse), or the valve may
be closed to not pass water. The pump must be off before
changing a valve setting.
MURIATIC ACID (31.45% hydrochloric acid) - Also called
liquid acid - An acid used to reduce the pH and
alkalinity levels in pool water. It is also used in acid
washing, a process that removes stains and scale from
pool plaster.
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