Filter Parts Why General Filter MULTIBLOCK MULTICRETE II

Filter Parts – Why General Filter MULTIBLOCK, MULTICRETE II, ESSD Washtroughs, Media & In-Bed Air Wash Grids

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.

We have the complete Filter System! WASHTROUGHS MEDIA AIR GRIDS UNDERDRAINS CONTROLS

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® Competitor Wx. H L Block Connection Leopold-S® 11” x 12” 48” Snap fit Severn Trent –U Block™ 12” x 12” 36” Snap fit, single gasket Inflico Tetra™ –U 12” x 12” 36” Snap fit, single gasket Roberts Trilateral® 10 5/8” x 12 1/2” 48” Bell & spigot and O-ring

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

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

Comparison of the Two Shields We Offer Porous bead design § 3, 000 sq. in. / sq. ft. of filter MS-500 Shield 500 micron 3/4" thickness 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 Laser Shield 0. 20 mm slots 0. 06" thickness

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%

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: Contra. FAST Packaged Plate Settlers

Application Areas Single, Dual and Mixed media Concrete filters § Conventional layout § Cen. TROL® filter Steel filters Packaged plants § Trident® and Trident HS Systems § Aquarius® Systems

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.

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 Ovivo EWT™ Flexscour® EIMCO Folded Plate Johnson TRITON® Leopold LP Used with our MULTIWASH Troughs Wes. Tech hasn’t seen a lot of these. Not seen many of these Used by Wes. Tech in various applications. Max length 16’ from flume Not suitable for high A/W rates Highly competitive.

MULTICRETE II Underdrain Provides Installation Options Standard ACI 318 loadings § 1, 600 psf , 1, 400 psf Doweled Rebar Design Keyway Design

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 MULTICRETE II 653, 225 sq. ft. 385+ sites Millions of nozzles Mid 1960’s 1986 Today

Quarter-Turn Insert Reduces Installation Time, Ensures Proper Fit MULTICRETE II Form (from below) Insert (inverted) and form opening Stop Lobe Pier locking ring Insert installed in form Less than 1/8” deflection during installation

MULTICRETE II Provides Simple Formwork Installation Inspected by our Service Personnel Anchorage pull tested Install nozzles after curing Concrete installed

Dual Air Distribution Ensures Uniform Backwash Identical headloss nozzles Air blanket (secondary distribution) Air header & risers (primary distribution) Low headloss open plenum

Nozzle Design Ensures Uniform Distribution Assembly screws slot openings > tailpipe area Nozzle cross-section Tailpipe section (control orifice)

Application Areas All concrete filter applications § Conventional layout § Cen. TROL® § MULTIWASH Filtration Process Our preferred underdrain for Wastewater Filtration Single, Dual and Mixed media needs support gravel

Competition: Monolithic Floor Underdrains IDI Form Orthos Underdrain Eimco Castkleen Using tighter nozzle spacing (4”-6”) to keep others out Orthos much lower experience on complete supply Large underdrain form = 48” square. Will use concrete prepoured support walls or piers IDI has good experience base. Adjustable insert height for leveling

MULTIBLOCK or MULTICRETE II? MULTIBLOCK MULTICRETE II § Lower profile § Larger plenum § No access § Less headloss § Packaged steel plants § Plenum access § Concrete tanks § Gravel or gravelless § Limited water/air rates § WTP and WWTP § Mixed media § Unlimited water/air rates

ESSD™ Washtroughs Deliver Durability and Cost Effectiveness 417+ installations Webbing adds strength Light gage (12 -16 ga. ) material

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

General Filter offers a number of filter Medias to complete a “system” package Sand media § Depth 24” Dual media § 12” sand 0. 45 – 0. 55 mm § Size – 0. 45 – 0. 55 mm § 18” of anthracite § Fe < 0. 3 ppm § 0. 8 – 1. 0 mm or § 1. 0 – 1. 2 mm Manganese Anthra/Sand Natural media § Media conditioned in the field Developed in 1980’s § Fe < 7 ppm § Overcomes shortcomings of greensand § Size 0. 6 -0. 8 mm Mixed Media Various media sizes available § Fe < 4 ppm § Garnet, Sand, Anthracite § Media selection is based on Anthracite § Depth 24” § Raw water quality All granular media configurations can be coated as Manganese ANTHRA/SAND. Our advantage is that since our media is coated insitu, everything is coated even the support gravel, making effective use of all the material in the vessel. • § Desired effluent quality 252+ installations since 1980 § Largest installation – 39. 7 MGD – Eagan, MN

Manganese Anthra/sand Still Outstanding compared to competition. Recent studies (2012) by John E. Tobiason, Ph. D, 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.

In-Bed Air Wash Grids § Located at mediagravel interface § Headers § PVC § Stainless Steel § Laterals § Polyethylene § PVC § Stainless Steel § Distributors § ABS plastic § Slotted lateral

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!

Filter Parts MULTIBLOCK, MULTICRETE II, ESSD Washtroughs, Media & In-Bed Air Wash Grids