Texas Register, Volume 23, Number 49, Part IV, Pages 12451-12559, December 4, 1998 Page: 12,504
12451-12559 p. ; 28 cm.View a full description of this periodical.
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1. Chemical Values Minimum Ideal Maximum
Total alkalinity' (buffering), ppm as
CaCO3 60.0 80.0 - 100.0 2 180.0
100.0- 120.0 3
Total dissolved solids, ppm 4 300.0 1000.0- 3000.06
2000.0'
Calcium hardness, ppm, as CaCO 7' 150.0 200.0 - 400.0 500.0 - 1000
Heavy metals None None None2. Biological Values Minimum Ideal Maximum
Algae None None None
If algae are observed:
-shock treat pool. See 265.204(b)(6).
-Supplement with brushing and vacuuming
-Maintain adequate disinfectant residual.
-Use approved algaecide according to label directions.
-Maintain stabilizer level below maximum.23 TexReg 12504 December 4, 1998
' If total alkalinity is to low this may result in pH bounce and be will tend to be corrosive. If total
alkalinity is to high this may result in cloudy water, increased scaling potential and pH may to be
too high.
2 For the following sanitizers: calcium hypochlorite, lithium hypochlorite, and sodium hypochlorite.
3 For the following sanitizers: sodium dichlor, chlorine gas, and bromine compounds.
4These values offered as guidelines rather than absolute values to indicate concern for accumulation
of impurities in the course of operation. Excessive high TDS may lead to hazy water, corrosion of
fixtures, etc., and can be reduced by partial draining with addition of fresh water.
5 High initial TDS may indicate poor water quality due to corrosive mineral salts, humus, or organic
matter.
6Increasing TDS indicates build up of impurities to be controlled by partial drain/refill with fresh
water.
7 Operation of pools at maximum hardness will depend on alkalinity (buffering) requirements of the
sanitizer used. Minimum alkalinity and lower pH shall be used with maximum hardness (Over 500
ppm).Texas Register
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I - L- I --- IIL - - I -- - _ L~L _ I .. ~ C-L-~I - ~-C- ---~- _ _ _ _ ~
Figure: 25 TAC, (265.204(b)
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Texas. Secretary of State. Texas Register, Volume 23, Number 49, Part IV, Pages 12451-12559, December 4, 1998, periodical, December 4, 1998; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth379984/m1/64/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.