Blue Bowl

What Is the Blue Bowl Gold Concentrator?

The Blue Bowl is a recirculating water concentrator that separates fine and flour gold from heavy black sands (magnetite and hematite) during final cleanup. Water pumped into the bowl creates a continuous vortex: lighter sands ride the current up and over the center cone while gold - roughly four times denser - drops out of the flow and settles into the bottom grooves. Unlike static panning, the vortex prevents re-mixing, which is why a properly tuned Blue Bowl recovers microscopic flour gold that panning routinely loses. It runs from a 12-volt pump and a five-gallon bucket, so you can do final cleanup at camp or at home without wasting water.

Choose Your Setup: Complete Kits, Bowl Only, or Parts

This collection covers every stage of ownership. Complete kits bundle the bowl with a pre-plumbed pump and leg levelers - the top kit adds a sniffer bottle and glass vial — so you can run concentrates the day it arrives. The bowl on its own, available bare or with the control valve and wire legs installed, suits prospectors who already own a suitable pump. Our pre-plumbed 750 GPH 12-volt submersible pump matches the flow-rate guidance below, and replacement parts - control valves, valve fittings, washers, wire legs, and leg levelers - keep a well-used bowl running for years. Sniffer bottles, suction bulbs, and 12" gold pans round out the cleanup bench.

Blue Bowl Technical Guide: Optimizing Fine Gold Recovery

In our experience both out in the field and in the cleanup shack, the Blue Bowl is unmatched for stripping away heavy black sands during final cleanup. To get the most out of your setup, paying attention to water flow, material classification, and surface tension is critical.

Choosing the Right Water Pump and Flow Rate

Getting the vortex dialed in requires a consistent, adjustable water supply. For optimal operation, use a 12-volt submersible pump rated between 500 and 750 Gallons Per Hour (GPH) - the pre-plumbed 750 GPH pump in this collection is sized exactly for this connected to a 3/4-inch hose with an inline flow-control valve for fine-tuning. The goal is to keep the water moving just fast enough to wash the lighter black sand over the center cone without carrying your fine gold with it. A standard five-gallon bucket or larger mixing tub works perfectly as a recirculating reservoir.

Mesh Classification: Preparation Is Key

The secret to the Blue Bowl's efficiency is running uniformly sized material. Never run raw, unclassified dirt directly into the bowl. For the best recovery rates, classify your concentrates down to at least 30-mesh, though 50-mesh or finer is optimal. When all particles are a similar size, gold's specific gravity easily overcomes the water flow, letting it drop out of the vortex and settle into the bottom grooves while lighter sands wash away.

Pro Tip: Breaking Surface Tension

Fine flour gold has a stubborn tendency to float due to water's natural surface tension. Before running classified concentrates, add a couple of drops of a liquid surfactant, a dishwasher rinse aid or mild dish soap to your recirculating water. This breaks the surface tension so microscopic gold sinks into the grooves instead of floating away.

Maintenance and Care Between Runs

After final cleanup, rinse the bowl thoroughly with fresh water to clear residual sand. Check the pump's intake screen for silt or debris to maintain full water flow, and store the high-impact plastic bowl out of direct sunlight to prevent UV degradation. With proper classification and flow control, a Blue Bowl delivers years of reliable, high-yield gold recovery and if a fitting or washer ever wears out, the replacement is in this collection for a few dollars.

Complete Your Gold Prospecting Setup

The Blue Bowl handles final cleanup, but it's the last step in the chain. Browse our full gold prospecting equipment for classifiers, pans, and sluice gear that feed it, and consider the Prospector's Dream vortex mats that pair with the bowl. Hunting nuggets at the source? Compare dedicated gold metal detectors and Falcon gold probes for locating ore, plus rugged digging tools and picks for getting it out of the ground. New to detecting for gold? Our full range of metal detectors and the Detecting & Prospecting Guide will point you to the right machine. Questions about which kit fits your operation? Call (844) 771-0707