VII. TROUBLE SHOOTING PROCEDURES
PROBLEM
POSSIBLE CAUSES
SOLUTIONS
Poor Filtration
Excessive flow through filters,
causing “coning” of media sand
and/or forcing contaminants
through filter outlet.
Air in tank(s) may cause
disruption of the media sand
bed.
Incorrect media sand.
Excessively high pressure
differential before backwashing,
which forces contaminants
through filter bed.
Insufficient volume of media in
filter, which allows
contaminants to pass through
the system.
1. Install throttling valve to control flow.
2. Bleed off trapped air in system.
3. Replace with proper media sand.
Consult your LAKOS representative.
4. Backwash more often at lower
differential pressure.
5. Add proper sand media to tank(s) to
specified level.
Consistently
High
Pressure
Differential
Excessive contaminant load
restricts flow through the filters
and prevents sufficient flow for
backwashing.
Insufficient backwash flow.
Inadequate media sand volume,
which may minimize coverage of
backwash flow across filter bed,
creating dead spots of
accumulated contaminants.
1. Drain tank and remove manway
access ports. Carefully skim away any
excess or caked contaminants from
the media sand bed’s surface. Return
tank to normal service and backwash
system.
2. Check backwash valve linkage for
proper operation.
3. Add sand media as necessary.
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