Mermade 30" x 60" Centre Bottom Outlet, Cover Only

The Mer-Made 30" × 60" Center Bottom Outlet — Cover Only (cataloged under Part # 775-COVER / VFC-3060-CBO) is the tailored replacement synthetic fabric filter jacket envelope designed to re-cover existing bare leaf cores in deep-vault commercial vacuum DE pits, 50-meter Olympic natatoriums, water parks, and high-capacity surge-tank filtration arrays.

This model is engineered for tall, extended-span frames measuring 30" wide horizontally across the base by 60" high vertically (a full 5-foot vertical reach), featuring a factory-reinforced circular cutout collar centered along the bottom 30" horizontal rail. It supplies only the tailored synthetic filtration cloth, centered bottom discharge opening, top closure system, and paired replacement compression sealing gaskets. It is specified when the internal polypropylene drainage grid matrix core and rigid PVC/CPVC border framing remain structurally sound, but the existing fabric has blinded from mineral scaling, calcified DE, or body oils, or has suffered physical tears from repeated backwash cycles.

Technical Specifications & Scope of Delivery

Material Properties & Chemical Tolerances

• Chlorine & Saline Resistance: Virgin woven polypropylene fibers resist degradation, rot, and hydrolysis under continuous exposure to elevated free chlorine levels, shock hyperchlorination treatments, and saline electrolytic pool water (2,500 to 5,000+ ppm NaCl).

• Acid Wash Survivability: Withstands routine seasonal chemical descaling baths in dilute muriatic (hydrochloric) or citric acid solutions to dissolve calcified DE crust, calcium carbonate, and iron scale without deteriorating seam threads or collar reinforcement stitching.

• Pre-Coat Retention & Release: The balanced monofilament weave structure retains standard DE powder and perlite grades without bleed-through during initial pump startup, while facilitating clean cake release during backwashing or manual hose-down.

Physical Dimensions & Weight Estimates

• Individual Cover Net Weight: Approximately 1.45 to 1.95 lbs (0.66 to 0.88 kg).

• Single Boxed Cover Shipping Weight: Approximately 2.90 to 4.20 lbs (1.32 to 1.91 kg) in a compact corrugated carton.

• Master Carton / Multi-Pack (6 to 12 Covers): Approximately 14.0 to 26.0 lbs (6.4 to 11.8 kg).

• Full Bank Overhaul Pack (20 to 30 Covers): Approximately 35.0 to 54.0 lbs (15.9 to 24.5 kg).

Field Re-Covering & Tensioning Steps

1. Strip Old Jacket & Inspect Frame: Remove the 5-foot leaf from the pit, open the top Velcro closure, and peel the spent cover off the frame. Discard the compressed felt collar. Pressure-wash the bare polypropylene drainage grid and inspect the full 60" vertical stiles and 30" border rails for rough weld beads, flash, or cracks that could snag or cut the new fabric during sleeving.

2. Sleeve the Frame: With two technicians supporting the 5-foot frame, slide the replacement envelope down over the 60" height along the 30" width, guiding the reinforced center opening over the protruding center-bottom discharge spud.

3. Seat the Spud Collar: Stretch the reinforced collar cutout snugly around the base of the center hub until seated flush against the molded locating shoulder without bunching or twisting.

4. Tension & Seal: Pull the fabric upward evenly from both sides across the 30" × 60" face to eliminate wrinkles or bagging (loose fabric over a 5-foot vertical span permits DE cakes to bridge, sag, and slough off prematurely under vacuum). Firmly press the Velcro closure flap closed across the 30" top rail to lock in uniform tension.

5. Mount Gasket: Slide a fresh high-density felt compression collar onto the center-bottom outlet spud against the locating shoulder before lowering the re-covered leaf back into the floor manifold receiver socket.