Commercial Pool and Spa Supplies
Mermade Filter Add-On, Gauge Panel (Per Filter Tank)
Mermade Filter Add-On, Gauge Panel (Per Filter Tank)
SKU:MF-GP
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The Mer-Made Commercial Filter Gauge Panel Add-On (Per Filter Tank) is an engineered operational accessory manufactured by Mer-Made Filter, Inc. Designed for direct mounting on single horizontal pressure vessels or dedicated mounting per vessel in stacked dual-tank configurations, this assembly monitors operational head loss, media bed compaction, and differential pressure ($\Delta P$) across the sand bed. It provides clear visual cues for backwash initiation, ensuring compliance with commercial public pool codes (such as Model Aquatic Health Code / MAHC, NSF/ANSI Standard 50, and local health department regulations).
The assembly is built around a non-corrosive, chemical-resistant mounting backplate—typically high-impact PVC or molded fiberglass (FRP)—outfitted with two heavy-duty, liquid-filled commercial pressure gauges (or a specialized dual-pointer differential gauge), along with Schedule 80 PVC interconnecting tubing, brass/bronze or 316 stainless steel isolation petcocks, and manual air bleeder valves.
| Parameter | Specification |
| Accessory Reference | Mer-Made Pressure Differential Gauge Panel Assembly |
| Application | Per Filter Tank (1 panel required per single vessel; 2 panels recommended for stacked dual-tank systems) |
| Gauge Type | Dual 2.5 in or 4.0 in (63 mm or 100 mm) dial gauges (Inlet / Filter Influent & Outlet / Filter Effluent) |
| Alternative Instrumentation | Optional single-dial direct differential pressure ($\Delta P$) gauge with color-coded clean/dirty zones |
| Pressure Range | 0 to 60 psi (standard) or 0 to 100 psi (0 to 4.14 bar / 0 to 6.89 bar) |
| Gauge Construction | 304 or 316 Stainless Steel casing, acrylic or polycarbonate shatter-resistant lens |
| Gauge Internals | Phosphor bronze or 316 SS Bourdon tube, brass or stainless steel movement |
| Gauge Fill Fluid | Liquid glycerin or silicone filled (dampens hydraulic pulsation and pump vibration) |
| Mounting Backplate | Heavy-duty 1/4" to 3/8" thick industrial PVC, UV-stabilized ABS, or FRP composite |
| Mounting Location | Factory-bracketed to filter face piping manifold, vessel shell bracket, or nearby wall |
| Interconnect Tubing / Lines | 1/4 in or 3/8 in OD high-pressure semi-rigid polyethylene, nylon, or copper tubing |
| Isolation Valves / Petcocks | 1/4 in NPT brass, bronze, or 316 stainless steel mini-ball valves or needle test cocks |
| Air Bleed Feature | Manual push-button or petcock air vent assembly integrated into the gauge lines |
| Operating Temperature Range | 32°F to 140°F (0°C to 60°C) |
| Operating Pressure Rating | Up to 100 psi (6.89 bar), matching vessel proof limits |
| Compliance / Standards | NSF/ANSI Standard 50, MAHC Section 5.7 compliant |
The gauge panel taps directly into the high-pressure filter inlet piping (influent) above the internal distribution header and the low-pressure filter outlet piping (effluent) downstream of the underdrain collector. By comparing the influent pressure against the effluent pressure, operators determine the exact differential pressure across the sand bed.
Operational Guidelines
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Clean Filter Baseline: Typically 3 to 6 psi $\Delta P$ across a newly backwashed media bed at design flow rate.
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Backwash Trigger Point: A rise of 8 to 10 psi over the clean baseline indicates media loading and signals the need for an immediate backwash cycle to prevent channeling, loss of turnover rate, or pump deadheading.
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Shipping Weight: Approx. 6 to 12 lbs (2.7 to 5.4 kg) per panel assembly, complete with panel backplate, gauges, valves, hardware, and interconnect tubing.
