Chemical fouling, typically due to carbonate, sulphate, silica, Iron, occurs as a result of the concentration of dissolved inorganic salts at the membrane surface, as pure water flows through the membrane, if the ionic product of a dissolved salt exceeds its solubility product then precipitation can occur, leading to fouling of the membrane surface.

Historically, mineral acids and polyphosphate were used to control deposition in both brackish water and seawater operations, but neither were satisfactory in all conditions. Mineral acids can present serious supply problems and safety hazards to plant operators. The use of acid also requires accurate dosing and control if scaling and corrosion problems are to be minimized. Sulphuric acid can also contribute to sulphate scaling problems. Polyphosphate is not considered to be completely effective against sulphate deposition.

Product List

No	Product Name	Application
1	PURETREAT RO50A --Anti-scalant/Dispersant	Anti-scalant for controlling high effective on the Calcium carbonate, calcium sulfate, barium sulfate and so on, and  used in well water
2	PURETREAT RO100A --Antiscalant/ Dispersant	Anti-scalant for effluent waters with high levels of metal oxides Organic Calcium carbonate, calcium sulfate, barium sulfate , used in Surface water.
3	PURETREAT RO150A --Anti-scalant/ Dispersant	Anti-scalant for controlling high effective on salt for calcium  Carbonate, Sulfate Fluoride and calcium phosphate used in Sea water.
4	PURETREAT RO200A --Anti-scalant/ Dispersant	For all waters with a high silica content Control Calcium Sulfate of the concentration 10000ppm
5	PURETREAT RO220A --Anti-scalant/ Dispersant	For all waters with a high silica content Control  Silica of the concentration 400ppm
6	PURETREAT RO280A --Anti-scalant/ Dispersant	Anti-scalant for controlling high effective on salt for COD calcium  Carbonate, Sulfate Fluoride and calcium phosphate used in reuse water.
7	PURETREAT RO RO300A --Anti-scalant/ Dispersant	Anti-scalant for controlling high effective on salt for COD calcium  Carbonate, Sulfate Fluoride and calcium phosphate used in  RO concentrate  water.
8	PURETREAT RO380A --Anti-scalant/ Dispersant	Anti-scalant for controlling high effective on salt for COD calcium  Carbonate, Sulfate Fluoride  used in Landfill leachate water.
9	PURETREAT 500C -- Acidic Liquid Cleaner	Composed of chelating agent and Surface active agent.  Typically dosage is 2-4% according to fouling , inorganic scale and metal oxides on the membrane systems.
10	PURETREAT 580C -- Alkaline Liquid Cleaner	Composed of chelating agent and Surface active agent . Typically dosage is 2-4%, according to fouling , organic, protein, colloid, sludge slime and calcium Sulfate on the membrane systems.
11	PURETREAT 905B -- Non-Biocide	Composed of complex organic bromide. Typically dosage is 2-10ppm on line or 50-100ppm intermittent according to microorganism , bacteria , sludge slime on the membrane systems.
12	PURETREAT 915B --Non-Biocide	Composed of organic bromide. Typically dosage is 500-1000ppm on cleaning according to microorganism , bacteria , sludge slime on the membrane systems.
13	PURETREAT 920F -- Tube Flocculant	Composed of inorganic and organic flocculant. Typically dosage is 2-10ppm according to ss and colloid ,applied in low, medium and high  turbidity water type.
14	PURETREAT 925F -- Tube Flocculant	Composed of organic flocculant. Typically dosage is 2-10ppm according to ss and colloid ,applied in low, medium and high  turbidity water type.
15	PURETREAT 928D -- De-Chloride	Composed of sodium bisulfite. Typically dosage is 2-10ppm according to Residual chlorine on the membrane systems.
16	PURETREAT 950D -- De-foam	Composed of organic ether. Typically dosage is 500-1000ppm intermittent according to foam ,applied in Membrane Bio-Reactor.