Packing: 1l, 5l

Instructions for Use “April-Bas” Disinfectant for Water Treatment and Disinfection in Swimming-Pools, Water Parks, Ponds and Fountains and for Prevention of Biological Growth

1. General Information

1.1. The “April-Bas” antimicrobial agent is a liquid polyhexamethylene guanidine hydrochloride (PHMG-HC) concentrate, transparent colourless to yellow liquid (pH of 1% solution is 6.0 to 9.5).
1.2. The “April-Bas” agent effectively kills bacteria, fungi and viruses. The agent also has deodorizing properties.
1.3. By parameters of acute toxicity, “April-Bas” is class 3 per GOST 12.1.007-76, i.e. a moderately hazardous substance, when administered to the stomach; and class 4, i.e. low toxic substance, when applied to the skin. When inhaled in saturating concentrations, the vapours are low toxic and classified as hazard class 4 by their volatility. The “April-Bas” agent has prominent local irritating effect. The threshold of one-time local irritating effect of the agent solution is above 20% concentration, and the threshold of repeated local irritating effect on the skin is at 1% concentration. In case of contact with eyes, the agent has distinct irritating effect on the mucous membrane, involving the cornea, which may pose a risk of vision loss.
1.4. The maximum permissible concentration (MPC) of polyhexamethylene guanidine hydrochloride in air in working zones is 2.0 mg/m3 (in spray); and MPC of the substance in water of swimming-pools, water parks and service utility and recreational water bodies is 0.1 mg/L.
1.5. The agent can be stored in original packaging during 3 years; freezing and defrosting has no effect on properties of the active substance. The agent should be kept away from children.

2. Instructions for Use

2.1. For quicker mixing of the “April-Bas” agent in water of a swimming-pool, agent-based working solution (0.5% aqueous solution) is used, which is prepared on site in a tank made of any material by mixing the agent with tap water conforming to the requirements set forth in Sanitary Regulations and Norms SanPiN
When treating water in a swimming-pool for the first time, the calculation norms provided in the table below should be used:

Amount of liquid “April-Bas” concentrate (L) required for disinfection of water in a swimming-pool (m3)
1 m3

10 m3

20 m3

Agent (mL) Agent (mL)

Agent (mL)

25 250 500


Preparation of “April-Bas” concentrate-based working solution for treatment of swimming-pool walls (basin):

Active substance content in solution, %

Working solution, 10 L

Working solution, 40 L

“April-Bas”, L

Water, L

“April-Bas”, L

Water, L

0.25 9.75 1 39


2.2. “April-Bas”-based solution should be introduced either to the swimming-pool basin directly or through a dispenser of the water treatment system.
2.3. When the agent is added to water in the swimming-pool, the water should be run through the recirculation system to ensure its thorough mixing with “April-Bas”-based solution. Later, the above guidelines should be followed each time the swimming-pool is refilled (partially refilled).
2.4. Water disinfection in swimming-pools and water parks shall be carried out taking into account specific features of operation of such facilities. Efficiency of disinfection is directly related to performance of the water filtration and circulation systems and to quality of water conditioning.
2.5. Water disinfection in swimming-pools using the concentrate should be carried out at 15 to 30 day intervals in concentrations 2.5 to 5 mL of the agent per 1,000 L of water.

3. Water Conditioning in Swimming-Pools

3.1. Before the swimming-pool basin is filled with water, its walls and bottom should be treated with 0.5% working solution.
3.2. The swimming-pool basin should be filled with water conforming to the requirements set forth in SanPiN 2.1.41074-01; and then the water purifying system should be turned on to remove possible mechanical pollutants from the water.
3.3. Water pH level should be measured – the standard pH level is 7.2 to 7.6. If appropriate, the level should be adjusted using any reagents approved for use in swimming-pools, after which fixed and free chlorine levels should be measured. If detected, chlorine should be neutralized chemically.
3.4. The volume of the swimming-pool basin should be calculated (using the formula “length * width * depth”) in order to more accurately determine the amount of the concentrate or working solution required.
3.5. The agent will remain active in water for up to 60 days. Its concentration in water should be measured once in 14 days. The agent should be added to water, as appropriate.

4. Safety Measures and First Aid in Case of Poisoning
5. Transportation, Storage, and Packaging
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