Membership Directory & Resource Guide - 2018 - 23

TECHNICAL BULLETIN NO. 3 * 2016 * pg 3 of 4

Reactions with the soluble cementitious materials
a surface that is capable of removing or dissolving
away elements or compounds of that surface, water
can take place whenever water, or moisture, is
will play a key role in the etching
Swimming
Poolthrough
Interiora Finishes
& Chemical Etchingchemistry
Deterioration
Issue No.process.
3 / PG 4 of 5
allowed
to permeate
cementitious
Low
calcium
hardness,
low
carbonate
alkalinity,
surface coating. Water that is not maintained in
and/or low pH create an aggressive environment
the "ideal ranges," as defined by ANSI/APSP to be
that will lead to etching in the areas with the
"balanced"6, can deteriorate a cementitious surfaceEtching Deterioration
greatest solubility and porosity such as in the
coating by dissolving components of the cement/
ITZ's. Continued leaching can cause complete
aggregate matrix, resulting in the leaching of cement
dissolution of the cement paste over time in those
compounds. Leaching generally appears as etched
regions of the coating.7
areas on the surface, especially where calcium
hydroxide is most abundant. Calcium hydroxide is
The National Plasterer's Council (NPC) considers
the most
soluble
cement
compound
and is the first Issue No. 3 / PG 4"balanced"
Swimming Pool Interior
Finishes
& Chemical
Etching
Deterioration
of 5
water chemistry to be swimming pool
compound to be dissolved.
water that is maintained in such a manner so as to
Etching Deterioration

prevent etching and/or scaling conditions to the
surface. The pool water should be kept within the
approved ANSI/APSP ideal levels.8

The pool/spa water pH, carbonate alkalinity,
calcium hardness and total dissolved solids,
should be frequently monitored and maintained
The National Plasterer's Council (NPC) considers "balanced" water chemistry to be swimming pool
with normal diligence such that the water is in
water that is maintained in such a manner so as to prevent etching and/or
scaling conditions to the
9
equilibrium.
Testing
surface. The pool water should be kept within the approved
ANSI/APSP
ideal should
levels . 8 take place one to two
times a week for pH, total alkalinity and free/total
The pool/spa water pH, carbonate alkalinity, calcium hardness
total
dissolved
solids,
should be
chlorineand
and
once
a month
for calcium
hardness,
Etching Deterioration
9
The National Plasterer's Council
(NPC) considers
"balanced" water
to be swimming
pool
frequently
monitored
and chemistry
maintained
with normal
diligence
such
that
the
water
is
in
equilibrium.
stabilizer
(cyanuric
acid)
and
TDS.
The
NPC
water that is maintained in such a manner so as to prevent etching and/or scaling conditions to the
Testing
take
place
one to
a week for pH, total alkalinity and free/total chlorine
.8
surface. The These
pool wateretched
should
beareas
kept should
within
approved
ANSI/APSP
idealtwo
levelstimes
arethearound
aggregate
particles,
encourages the use of the Saturation Index as the
and
once
a
month
for
calcium
hardness,
stabilizer
acid) and TDS. The NPC encourages the
The pool/spatile
water
pH, carbonate
calcium hardness
andoften
total dissolved
solids,
inserts
andalkalinity,
other interfaces
and
appear
asshould be9 (cyanuric
method to achieve balanced water. While APSP
use of the
Saturation
asthethe
method
to achieve balanced water. While APSP acknowledges
frequently monitored and maintained
with normal
diligenceIndex
such that
water
is in equilibrium.
small
spots.
chemical
oralkalinity
physical
action chlorine
on
acknowledges an acceptable Saturation Index
Testing should
take place
one toAs
twowith
times all
a week
for pH, total
and free/total
an acceptable Saturation Index range of -0.3 to +0.5, they state the ideal range is 0.0 to +0.5. The
Certain high performance durability finishes can
of time.

and once a month for calcium hardness, stabilizer (cyanuric acid) and TDS. The NPC encourages the
further
refines
the ideal
to acknowledges
0.0 to +0.3.
use of the Saturation Index asNPC
the method
to achieve
balanced
water. range
While APSP
an acceptable Saturation Index
range of -0.3
to +0.5,negative
they state the
ideal range
0.0 to +0.5.
The
tolerate
slightly
indices
forisshort
periods
NPC further refines the ideal range to 0.0 to +0.3. Certain high performance durability finishes can
tolerate slightly negative indices for short periods of time.

Technical Bulletins

Mechanism

Mechanism

Potential Deterioration / Issue

Low Calcium Hardness

Low Calcium
Hardness
Dissolution of calcium compounds;

Low pH

Low pH

Low Carbonate Alkalinity

discoloration

Low

High Cyanuric Acid Levels (stabilizer)

General dissolving of materials

Slow dissolution of hydroxide/bicarbonate
ions Alkalinity
Carbonate
Combination of dissolving and leaching;
pigment "fade" - low carbonate alkalinity

Cyanuric
Acid Levels
(stabilizer)
Direct physical contact with certainHigh
chemical
Discoloration,
water entrapment,
pigment
compounds (i.e. sodium chloride, cyanuric acid, alteration
granular chlorine products, sodium bisulfate,
shock treatments, etc.)
Direct physical contact with certain chemical

compounds (i.e. sodium chloride, cyanuric acid,
granular chlorine products, sodium bisulfate,
shock treatments, etc.)
NPC online.org · mail@npconline.org · ph: 847.416.7272 · fx: 847.526.3993

Potential Deterioration / Issue
Dissolution of calcium compounds;
discoloration
General dissolving of materials
Slow dissolution of hydroxide/bicarbonate
ions
Combination of dissolving and leaching;
pigment "fade" - low carbonate alkalinity
Discoloration, water entrapment, pigment
alteration

THE NATIONAL PLASTERERS COUNCIL · 1000 N. Rand Road · Suite 214 · Wauconda, Illinois 60084

23

N PCon li n e .org

847.416.7272 · fx: 847.526.3993


http://www.npconline.org/

Table of Contents for the Digital Edition of Membership Directory & Resource Guide - 2018

Contents
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