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* Oxalic acid should not be applied when wastewater contains calcium, since calcium oxalate may form on
the membrane surface which can choke membrane pores.
5. Handling of Chemical Agents
The chemical agents used for chemical cleaning are harmful to the health when in contact
with the skin. When you handle chemicals, wear protective goggles, protective gloves and
other protectors. Make sure to check the details of its material safety data sheet (MSDS) and
the instructions given below beforehand. If the chemicals get in contact with your skin, follow
the MSDS and take adequate actions for each chemical.
(1) Sodium hypochlorite solution / NaClO
(A) Handling precautions
(a) Ventilate well. Avoid heat sources and sparks. Also avoid contact with acids.
(b) Handle the chemical container with great care. Avoid toppling, bumping or
dragging it.
(c) Take care not to cause leak, spillover or spattering. Don't cause dust or vapor.
(d) Firmly seal the container after use.
(e) Thoroughly wash your hands and face and rinse out your mouth after using
chemicals.
(f) Don't eat or drink anything in the working place except in a designated place.
(g) Don't bring gloves or other contaminated protectors into the rest area.
(h) Forbid unauthorized entry to the place where chemicals are handled.
(i) Wear appropriate protectors to avoid inhalation, eye or skin contact, and direct
contact with your clothes.
(j) Provide local ventilation in the case of handling chemicals outdoors.
(B) Storage precautions
(a) Store the container in a dark, cold place. Avoid direct sunlight. Firmly seal to
prevent direct contact with air.
(b) Use corrosion-resistant containers for storage.
(2) Oxalic acid / (COOH)
2
(A) Handling precautions
(a) Keep away from strong acids and bases.
(b) Handle the chemical container with great care. Avoid toppling, bumping or
