FILTER TYPE 2" AAF
000616
-
10101
9
/
07.2017
Page
18
of
28
•
The cleaning solution can be used for several sets of discs. As the cleaning activity of the solution
deteriorates, it may be necessary to soak the discs for a longer time
Cleaning Carbonates and Iron Deposits:
•
Open the filter and remove the dirty discs.
•
Attention
–
Never open the filter before the pressure has been released.
•
Arrange the discs loosely on the plastic rope.
•
Prepare a 5% Solution of Hydrochloric Acid: pour 10 liters of water into one of the large containers
carefully add 2 liters of Hydrochloric Acid (30%) into the water.
•
Soak the discs in the solution so that both sides will be covered.
•
NOTE:
Carbonates react violently with hydrochloric acid (foaming, gas evolution).
•
To achieve maximum cleaning, agitate the discs several times with a stirring stick.
•
Contact time with cleaning solution: 1 - 8 hours.
•
Remove the discs carefully from the solution and rinse them well with clean water before placing them
back in the filter.
•
The recommendation is to wash the cleaned discs again in the filter to ensure that all chemical residues
ware removed.
•
The cleaning solution can be used for several sets of discs. It may be necessary to soak the discs for a
longer period of time as the cleaning activity of the solution deteriorates.
Cleaning Complex Deposits:
If the composition of the deposit is not known, perform the following test:
•
Take 5 discs for the test.
•
Soak 2 discs in a 5% Sodium Hypochlorite Solution.
•
Preparation of the solution: pour 1 cup of water into a small container, then add 1 cup of Sodium
Hypochlorite (10% NaOCl).
•
Soak 2 discs in a 5% Hydrochloric Acid Solution.
•
Preparation of the solution: pour 2½ cups (= 500ml) of water into a small container, then add carefully
•
½ cup (= 100ml) of Hydrochloric Acid (30% HCL).
•
Keep one disc as a control.
•
Observe the cleaning process: If one of the solutions removes all of the deposit, clean the discs in that
solution according to the instructions above.
•
If neither solution removes the deposit completely, continue with the test procedure.
•
Remove the discs from both solutions, Wash them with running water and soak them in the second
solution: put the two discs, which have been in the Sodium Hypochlorite Solution, in the
Hydrochloric Acid Solution, and the other way around.
•
Check the cleaning process: If one of the treatments removes all of the deposit, clean all of the discs
following the same two-step procedure in the exact same order. Wash the discs well between the two
cleaning processes.
•
If the deposit hasn
’
t been completely removed, send a set of untreated discs to the laboratory for
further examination.
