Differences in the application of BCDMH, TCCA SDIC in water treatment

Bactericidal Spectrum and Efficiency

Broad-spectrum and highly effective against bacteria, viruses, fungi, algae, and especially spores. Bromine and chlorine work synergistically for strong biofilm penetration.

Highly effective, with rapid sterilization and strong algae control.

Highly efficient and fast-acting, dissolves quickly, and takes effect rapidly.

For routine, rapid sterilization: Dichlorophenoxyacetate > Trichlorophenoxyacetate. For combating stubborn microorganisms (such as spores): Bromochlorohydantoin is superior.

Stability and Durability

Excellent. Slow hydrolysis maintains effective concentration for a long time, providing continuous protection and reducing dosing frequency.

Good. Trichloroisocyanuric acid is stable in solid form, but it is consumed relatively quickly in water.

Generally effective. Dissolves quickly, but is also consumed quickly, requiring more frequent additions to maintain concentration.

For long-lasting effects: Bromochlorohydantoin is the first choice. For shock treatment: Dichlorophenoxyacetate/trichlorophenoxyacetate is more suitable.

pH Dependence

Low activity. Maintains high activity over a wide pH range (especially alkaline).

High. Hypochlorous acid activity decreases significantly at pH > 7.5; attention should be paid to adjusting the water pH to slightly acidic.

Highly effective. Similar to trichloroisocyanuric acid, pH control is necessary to ensure effectiveness.

For high pH or alkaline water: Bromochlorohydantoin has a significant advantage. When water quality is unstable, Bromochlorohydantoin is more worry-free.

Corrosivity and Irritation

Low activity. Relatively low corrosiveness and irritation to skin, mucous membranes, metal equipment, and pool walls.

Relatively high. Strong oxidizing properties; highly corrosive to metals; irritating to skin and mucous membranes.

Relatively high effectiveness. Similar to trichloroisocyanuric acid, but with strong corrosive and irritating properties.

For scenarios with high equipment maintenance requirements/high human contact (such as hot springs, intensive aquaculture): Bromochlorohydantoin is safer.

Resistance to Organic Matter Interference

Strong activity. Maintains good bactericidal power even in water rich in organic matter and ammonia nitrogen (such as aquaculture ponds), and the brominated ammonium bromine still has bactericidal effect.

Weak. Hypochlorous acid readily reacts with organic matter and ammonia nitrogen, being consumed to form chloramines (weak effect and odor), leading to rapid loss of available chlorine.

Weakly effective. Similar to trichloroisocyanuric acid.

For poor water quality and high organic matter content (such as in the later stages of aquaculture): Bromochlorohydantoin has more stable effects and is more economical.

Odor and Byproducts

Low chlorine odor and relatively few byproducts such as trihalomethanes.

Strong chlorine odor; easily forms chloramines (pungent odor) and more trihalomethanes in water containing organic matter.

Similar to trichloroisocyanuric acid.

For indoor swimming pools or hot springs sensitive to air quality: Bromochlorohydantoin provides a better experience.

Cost

Relatively high unit price. However, due to low dosage, long-lasting effect, and low loss, the overall cost of use may be lower.

Medium unit price. However, it is consumed quickly; large quantities are required in highly polluted water, and the overall cost needs to be evaluated.

Competitive unit price. However, frequent additions are required, potentially increasing labor and monitoring costs.

Considering overall cost-effectiveness: For good water quality and meticulous management, Trichlorophenoxyacetate/Dichlorophenoxyacetate is suitable; for complex water quality, long-lasting effects, and reduced manual labor, Bromochlorohydantoin may be more cost-effective.