pH up, TA not affected: Biolight generates OH (Hydroxyl), a strong oxidizer, which gains electrons resulting in OH- (hydroxide ions) which increase the pH but not the alkalinity.
pH up, TA up: Preferred is Sodium bicarbonate (baking soda) NaHCO3:
2,5gr/l gives max pH 8,4
NaHCO3 + H+ > Na+ + H2O + CO2
Soluble in water (10% solution @ approx. 25°C), temperature rises moderate, pH up.
Sodium carbonate (soda ash) Na2CO3:
5gr/l gives max pH 11,58
Na2CO3 + 2H+ > 2Na+ + H2O + CO2
Soluble in water (20% solution @ approx. 25°C) temperature rises approx. 6°C, pH up.
pH down, TA up: CO2:
is uniquely able to lower pH while raising carbonate alkalinity.
CO2 is a "soft" pH down unable to lower pH below 6.7.
CO2 shows no evidence of promoting algae growth.
CO2 raises alkalinity over time and lowers CORROSION
Ideal pH-Alkalinity-CaHardness respectively:
7.2-7.6; 80-120 ppm; 180-220 ppm
Too acid water: It will corrode metal equipment, cause etching on the surface materials and cause skin irritation.
Too alkaline water: it causes scaling on surface and plumbing equipment and makes the water cloudy.
Alkalinity water treatment
What is normal alkalinity for water?
The amount of Alkalinity that should be in our water is 20-200 mg/L for typical drinking water. Alkalinity is basically dissolved minerals in the water that help neutralize the water we drink.
Supplementing Alkalinity: Common chemicals used to increase alkalinity and pH include: Calcium oxide or calcium hydroxide (as lime slurry), preferred is Sodium bicarbonate (baking soda, 10% solution), Sodium carbonate (soda ash, 20% solution), not-recommended is Sodium hydroxide (caustic soda).
How do I raise or lower my alkalinity?
To raise low alkalinity and stabilize your pH, use sodium bicarbonate over a period of time. To lower high alkalinity (usually not needed), use a weak acid, except for H2CO3 (carbonic acid).
