Page 48
SECTION 10 - REFERENCE
10.1 BASIC WATER CHEMISTRY
The Digital Nano/Nano+ is
designed to produce chlorine on a daily basis. To monitor the system’s
efficiency, the water chemistry ranges, and schedule of periodic checks should be followed.
See “Water
Balance and Chemistry Recommendations
” on page 7 for chemistry levels.
CAUTION:
Failure to heed the following may result in equipment damage.
Excessively high chlorine levels can cause premature cell failure and corrosion
damage to pool fixtures and equipment.
Always follow the instructions on the manufacturer's label whenever handling or using
chemicals.
CHEMICAL
IDEAL
TEST
SCHEDULE
EFFECT OF
LOW / HIGH LEVELS
CORRECTIVE ACTIONS
Free Chlorine
Weekly
Low free chlorine: Not enough residual
chlorine to safely sanitize pool water.
Low free chlorine: Check for combined
chlorine level and shock as necessary.
Increase chlorine output to maintain a 1-3
ppm (mg/L) residual reading.
High free chlorine: Corrosive to metallic
fixtures in pool water. Can bleach
swimwear and hair.
High free chlorine: Decrease chlorine output.
Let chlorine dissipate normally until 1-3 ppm
(mg/L) is achieved. In extreme cases, pool
water can be diluted with fresh water or a
chlorine neutralizer added. (Diluting will
reduce salt and CYA. Check and adjust as
needed.)
pH
Weekly
Low pH: (acidic) Equipment corrosion,
eye/skin irritation, plaster etching, rapid
chlorine consumption
Low pH: Add sodium carbonate or soda ash
High pH: (basic) Scale formation, cloudy
water, eye/skin irritation, poor chlorine
effectiveness
High pH: Add sulfuric acid, muriatic acid or
sodium bisulfate.
Total
Alkalinity
Monthly
Low TA: Eye irritation, pH "bounce",
stained/etched plaster and metal corrosion.
Low TA: Add sodium bicarbonate.
High TA: Constant acid demand, difficulty in
maintaining pH, and contributes to scale
formation or cloudy water conditions.
High TA: Add sulfuric acid, muriatic acid
often or sodium bisulfate, a little at a time
(may take a week or more to lower the TA).
