1.Filter Parts – Why General Filter
MULTIBLOCK, MULTICRETE II, ESSD Washtroughs,
Media & In-Bed Air Wash Grids
2.What is The General Filter Advantage?UNDERSTANDING FILTRATION
Can improve operation an existing plant. (expansion & upgrades)
Thoroughly backwash filter media with air/water
Provide even distribution of backwash water and air throughout the filter basin.
Reduce backwash waste
Reduce off line time with shorter backwash durations
Complete the scope for a new plant.
3.We have the complete Filter System!
UNDERDRAINS
WASHTROUGHS
AIR GRIDS
MEDIA
CONTROLS
4.MULTIBLOCK® Underdrain Details Similar to Other Block Underdrains
12” tall x 11” wide 36” length
HDPE structural foam
Compensating dual lateral design
Media retaining or gravel support designs
Snap fit connection.
NSF/ANSI STANDARD 61
With or without Laser Shield®
5.Modular Design Easy to Install
Blocks snap together to form laterals
25 lbs/block - HDPE material
MULTIBLOCK Shield factory installed (if used)
Rebar pullout tested prior to block installation
Laterals installed in rows
+/- 1/8” level
Set on 3/4” grout bed
Joints filled with grout
Max length 30’ on each side of flume
6.Laser Shield® Provides Unique Direct Media Retention
0.06” stainless steel plate
0.008” (0.2 mm) slot openings
Minimizes opening surface area per volume
Stainless steel screws
Based on nozzle design
7.Comparison of the Two Shields We Offer
Porous bead design
3,000 sq.in. / sq.ft. of filter
Laser Shield
16 sq.in. / sq.ft. of filter
Porous bead difficult to clean
No clear passage for water
Laser Shield
Lower profile
Clearly defined, sharp edge openings
Retains smaller media
MS-500 Shield
500 micron
3/4" thickness
Laser Shield
0.20 mm slots
0.06" thickness
8.Air introduction
Two options
In-flume header with risers
Most Common Shown
Above with drop pipes
Stainless steel or PVC
Riser at each lateral
In-flume Design
9.MULTIBLOCK Cover A Wide Range of Flow Conditions
Backwash
Water only 5-30 gpm/sq.ft.
Air only 1-5 scfm/sq.ft.
Combined backwash
5 gpm/sq.ft. and 3 scfm/sq.ft. is typical
consult us for specific applications
Filtration
2-10 gpm/sq.ft.
Maldistribution in large basins
Less than +/- 10%
10.General Filter Scope of Supply
Underdrain blocks
Media retaining Laser Shield™
Rebar over flume
Flume bridges
End caps
Ancillary equipment
Air headers, washtroughs, media, controls, etc.
Pre-treatment equipment
Don’t forget backwash waste treatment products, such as:
ContraFAST
Packaged Plate Settlers
11.Application Areas
Single, Dual and Mixed media
Concrete filters
Conventional layout
CenTROL® filter
Steel filters
Packaged plants
Trident® and Trident HS Systems
Aquarius® Systems
12.Competition: Block Underdrains-Standard Height
We are seeing more and more installations where porous caps style underdrains are starting to fail. They have accumulated enough solids over the years that result in higher and higher backwash pressure resulting in ultimate failure
Leopold Type S
IMS Cap (porous bead) used for direct retention.
Patented water recovery channel and inside baffles
Severn Trent – Also Offered By IDI
Porous bead plate used for direct retention
Roberts Filter Group
Will use this to get in the door to promote Infinity. Lately have been very aggressive. In promoting the Air Grids.
Main selling feature is the single 30 ft block. This eliminates the joints, clips and seals. Backwash with water only, use air grid above. Can be retrofitted into existing
low profile filter cells.
13.Competition-Low Profile Underdrains
Limited to basins less than 20’ from feed flume.
Concern for dead spots on top of pyramids or between units.
Maldistribution is a key point to compete against.
Maximum air and backwash water rates may be limited.
AWI Phoenix Underdrain System
Used with our MULTIWASH Troughs
Johnson TRITON®
Used by WesTech in various applications.
Not suitable for high A/W rates
Ovivo EWT™ Flexscour®
WesTech hasn’t seen a lot of these.
Leopold LP
Max length 16’ from flume
Highly competitive.
EIMCO
Folded Plate
Not seen many of these
15.MULTICRETE II® Offers Long-Term Experience
Floor and nozzle design based on pre-cast design from 1960’s
Monolithic construction with over 19 years experience
Eliminated most joints
Light weight forms easier to handle
Nozzle design and spacing remained
Mid 1960’s
1986
Today
MULTICRETE II653,225sq.ft.385+ sitesMillions of nozzles
16.Quarter-Turn Insert Reduces Installation Time, Ensures Proper Fit
Insert (inverted) and form opening
Insert installed in form
Stop Lobe
MULTICRETE II Form (from below)
Pier locking ring
Less than 1/8” deflection during installation
17.MULTICRETE II Provides Simple Formwork Installation
Anchorage pull tested
Inspected by our Service Personnel
Concrete installed
Install nozzles after curing
18.Dual Air Distribution Ensures Uniform Backwash
Air header & risers (primary distribution)
Air blanket (secondary distribution)
Identical headloss nozzles
Low headloss open plenum
19.Nozzle Design Ensures Uniform Distribution
slot openings > tailpipe area
Nozzle cross-section
Tailpipe section (control orifice)
Assembly screws
20.Application Areas
All concrete filter applications
Conventional layout
CenTROL®
MULTIWASH Filtration Process
Our preferred underdrain for Wastewater Filtration
Single, Dual and Mixed media
Mixed media needs support gravel
21.Competition: Monolithic Floor Underdrains
IDI Form
Using tighter nozzle spacing (4”-6”) to keep others out
IDI has good experience base.
Orthos Underdrain
Orthos much lower experience on complete supply
Eimco Castkleen
Large underdrain form = 48” square. Will use concrete pre-poured support walls or piers
Adjustable insert height for leveling
22.MULTIBLOCK or MULTICRETE II?
MULTIBLOCK
Lower profile
No access
Packaged steel plants
Concrete tanks
Gravel or gravelless
Limited water/air rates
Mixed media
MULTICRETE II
Larger plenum
Less headloss
Plenum access
Concrete tanks
Gravel or gravelless
WTP and WWTP
Unlimited water/air rates
23.ESSD™ Washtroughs Deliver Durability and Cost Effectiveness
Light gage (12-16 ga.) material
Webbing adds strength
417+ installations
24.ESSDs Apply To Range Of Systems
Hydraulic capacity same as other troughs
Also used in pre-treatment basins
CONTRAFLO® Units
Settling basins
Clarifiers
Longer unsupported span compared to FRP
Up to 36 ft. length vs. 24 ft.
MULTIWASH ® baffles factory attached to trough
25.General Filter offers a number of filter Medias to complete a “system” package
Manganese Anthra/Sand
Natural media
Media conditioned in the field
Developed in 1980’s
Overcomes shortcomings of greensand
Various media sizes available
Media selection is based on
Raw water quality
Desired effluent quality
252+ installations since 1980
Largest installation – 39.7 MGD – Eagan, MN
Sand media
Depth 24”
Size – 0.45 – 0.55 mm
Fe < 0.3 ppm
Anthracite
Depth 24”
Size 0.6-0.8 mm
Fe < 4 ppm
Dual media
12” sand 0.45 – 0.55 mm
18” of anthracite
0.8 – 1.0 mm or
1.0 – 1.2 mm
Fe < 7 ppm
Mixed Media
Garnet, Sand, Anthracite
All granular media configurations can be coated as Manganese ANTHRA/SAND.
Our advantage is that since our media is coated in-situ, everything is coated even the support gravel, making effective use of all the material in the vessel.
26.Manganese Anthra/sand Still Outstanding compared to competition.
Recent studies (2012) by John E. Tobiason, PhD, PE, BCEE, Professor, Environmental and Water Resources Graduate Program, Department of Civil and Environmental Engineering, University of Massachusetts conducted some recent lab testing comparing Manganese Anthra/sand to macrolite and pyrolucite and reported
“In general, Jonathan found that the coating method worked well and seemed to provide a coating that worked well very soon after being put into service. “
This favorable results is expected to help increase sales in the Northeast.
27.In-Bed Air Wash Grids
Located at media-gravel interface
Headers
PVC
Stainless Steel
Laterals
Polyethylene
PVC
Stainless Steel
Distributors
ABS plastic
Slotted lateral
28.Filter Parts Summary
Many options for all situations
more options than any other manufacturer
Cost effective designs
MULTIBLOCK or MULTICRETE with MULTIWASH is an AWESOME SYSTEM!!!!!!!!!
Sell the features and benefits to beat the competition:
Plant tours
Increasing your offering to enhance your position
Case Studies…. We’ve done quite a few of them this year!
29.Filter Parts
MULTIBLOCK, MULTICRETE II, ESSD Washtroughs,
Media & In-Bed Air Wash Grids