Arkal Spin Klin, Service Maintenance Manual

Page: 10 / 37

8
Cleaning Recommendations for Clogged Filtration Discs
Water-formed deposits may cause clogging of the filter discs. The formation of these deposits
depends on the quality of the filtered water and environmental conditions like temperature, pH,
light, duration of filtration and more.
Common water-formed deposits are:
ƒ
Biological or organic deposits (mostly mucous or oily to the touch, beige, brown or
green in color)
ƒ Iron oxide (rust) or other metal oxides
ƒ Carbonates (white or gray deposit)
ƒ
Combinations of the above
If these deposits cannot be eliminated by pretreatment of the water, we recommend the
following cleaning procedure:
Material and Equipment
ƒ A well ventilated working place.
ƒ
2 small containers (1 liter), 2 large containers (15 liter) and a stirring stick, all
resistant to chemicals, preferably of polypropylene.
ƒ Plastic rope to tie up the disc.
ƒ Sodium Hypochlorite NaOCl -
Strong oxidizing liquid, commercial concentration: 10%.
Oxidizes and removes organic and biological deposits.
ƒ Hydrochloric Acid HCl -
Very corrosive liquid, commercial concentration: 30%.
Dissolves and removes carbonates, iron oxide, and other deposits.
ƒ
Safety equipment: safety glasses, gloves, long pants, long sleeved shirt and
shoes.
ATTENTION!
While working with chemicals protect yourself with the necessary safety equipment:
ƒ
Safety glasses, gloves, protective clothing
ƒ Work in a well ventilated area
ƒ
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