Mermade 30" x 36" Mermade Corner Outlet on Short Side, Cover Only

The Mer-Made 30" × 36" Corner Outlet on Short Side — Cover Only (cataloged under Part # 775-COVER / VFC-3036-COSS) is the tailored replacement synthetic fabric filter envelope engineered to re-cover existing bare leaf cores in commercial vacuum DE filtration systems where the effluent manifold pickup mates at the corner of the 30" short boundary edge.

This configuration features an asymmetrical, reinforced corner cutout collar located at the junction where the 30" short rail meets the 36" long rail. It supplies only the tailored synthetic filtration envelope, reinforced corner-spud opening, top closure system, and paired replacement compression sealing gaskets. It is specified when the internal polypropylene drainage grid and rigid PVC/CPVC border framing remain structurally sound, but the existing fabric has blinded from chemical scale, calcification, or body oils, or has torn from extended service.

Technical Specifications & Scope of Delivery

Material Properties & Chemical Tolerances

• Chlorine & Saline Resistance: Virgin woven polypropylene fibers resist chemical 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 embedded calcium carbonate crust, iron staining, and organic oils without deteriorating seam stitching or collar reinforcement threads.

• 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 0.85 to 1.15 lbs (0.39 to 0.52 kg).

• Single Boxed Cover Shipping Weight: Approximately 1.85 to 2.80 lbs (0.84 to 1.27 kg) in a compact corrugated box.

• Master Carton / Multi-Pack (6 to 12 Covers): Approximately 7.5 to 14.0 lbs (3.4 to 6.4 kg).

• Full Vault Overhaul Pack (20 to 30 Covers): Approximately 20.0 to 32.0 lbs (9.1 to 14.5 kg).

Field Re-Covering & Tensioning Steps

1. Verify Handing & Port Placement: Confirm whether the frame’s discharge spud is oriented to the left-hand or right-hand corner of the 30" short edge to ensure the asymmetric cutout on the replacement cover aligns correctly before installation.

2. Strip Old Jacket & Inspect Frame: Remove the spent leaf from the pit, open the closure seam, and peel off the degraded cover. Discard the compressed gasket. Pressure-wash the bare polypropylene drainage grid and inspect the frame borders for cracks, rough weld beads, or burrs that could snag or tear the new fabric.

3. Sleeve the Frame: Slide the replacement envelope down over the frame, guiding the reinforced corner opening over the protruding corner discharge spud on the 30" rail.

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

5. Tension & Seal: Pull the fabric taut across the 30" × 36" face from both sides to eliminate wrinkles or bagging (loose fabric allows DE cakes to bridge, sag, and slough off under vacuum). Firmly press the Velcro closure flap closed across the edge rail to lock in uniform tension.

6. Mount Gasket: Slide a fresh high-density felt compression collar or elastomeric ring onto the corner outlet spud against the locating shoulder before lowering the re-covered leaf back into the manifold receiver socket.