26
“Operation & Maintenance Manual”, “Discfilter HSF2600 series”
6.7.2 Chemical cleaning of filter panels
Long-term clogging of the filter media can be caused by, among other things, iron, calcium
or organic fouling. This clogging can normally be removed through chemical cleaning. Three
proven products that do not affect the life of the filter media are dilute hydrochloric acid
(HCl), dilute sodium hypochlorite (NaClO) and dilute sodium hydroxide (NaOH).
The use of other types of cleaning agents may cause damage to equipment.
The cleaning products must not be mixed. If HCl and NaClO mix, toxic chlorine gas forms.
HCl and NaOH are highly corrosive. For safety advice, see applicable local regulations.
For more detailed instructions, please contact your supplier.
Hydrotech Discfilter HSF2600 is equipped with a chemical ramp to enable cleaning of long-
term clogging of the filter panels.
The dosing equipment (option) must be connected to the chemical ramp connector, see
Figure 6.13. The control system is prepared and programmed for connection of a dosage
system. After completing electrical and mechanical installation, chemical cleaning is started
as follows:
1. Set the mode selector to AUTO and the pump switch to 1 (ON).
2. Set the number of cleaning sequences with the CLEANING SEQUENCE selector.
3. Start chemical cleaning with the CLEANING START switch.
Figure 6.13
A floor plate must be lifted to access the connection to the chemical ramp.
