pools are the oldest form of building
pools. The process
starts with digging a hole in the ground
and lining the hole with rebar. Then
the drains, skimmers, return lines, and
in-floor cleaning system are set into
place. After that, the pool is shot
with gunite. Then, the tile and
coping stones are set in place. Finally,
the pool is shot and troweled with
plaster. Once the plaster is finished,
the company usually starts filling the
pool with water.
the pool is full, the system is started
up and balanced with chemicals. This
is the time that takes the most work,
usually a lot
of brushing and backwashing due to dusting
from the new plaster.
called whitecoat or marcite, plaster is
an age old process of finishing many structures.
Used underwater, it provides the watertight
seal that the more porous gunite or shotcrete
beneath it cannot. Plaster finishes provide
twenty years of service under ideal conditions,
however, ours is rarely an ideal world.
The plaster surface is meant to degrade
slowly, eventually requiring a fresh coat.
has shading variations?
as mottling, and distinct from surface
stains and deposits, mottling may appear
as grayish hued areas. Rarely do I see
a plaster job that is white like milk.
They're usually white like clouds. Being
a natural product, mottling is inherent
in any plaster job and should not be considered
a defect. There has been much research
on the subject in recent years, however
no consensus has been reached on the causes
and cure of mottling.
from mottling, stains are usually localized
and distinct in color from the plaster.
Most stains are caused by heavy metal minerals
coming out of solutions and depositing
themselves on the nearest structure they
find. They may also remain suspended in
water, providing dramatic new color schemes.
Below is a chart listing common metals
found in pools, where they came from, and
their identifying colors.
has crystalline deposits?
Your pool water has precipitated metallic
salts out of solution. This will create
areas of the pool which are extremely rough
and scaly. There are several solutions
to remove these deposits, including acid
washing, sanding and the use of a calcium
deposit dissolving chemical called HydroQuest.
grout, mortar, cal-hypo chlorine
crystals or precipitate
blue, gray or black
algaecides, ionizers, corrosion
brass pipes, fittings and heaters
green & blue/green black, dark
red or teal
water, corrosion of iron pipe and
red, brown, black, gray or green
red, black or red
any of the above causes apply to you, your
pool should be using a sequestering
agent which aids your water
balance in preventing the metal from dropping
out of solution and staining underwater
surfaces. Most stains left by precipitated
metals can be removed by one form or another.
wash every few years will keep a pool
looking nice. (continued)