The Durham Geo range of skimmer systems adopts a modular approach comprising a range of skimmer assemblies and a range of pumps.  Optimum matching of the most appropriate pump to a skimmer is a function of a number of factors including:

•    Water table fluctuation range;
•    Type of Product and it’s viscosity;
•    Well diameter;
•    Quantity of product present; and
•    Depth from bottom of well to product/water interface
•    Nature of site including availability of services (power & compressed air).

Selection Guide for Skimmer Assemblies
Lower viscosity LNAPL: Choose Standard Skimmer
High viscosity LNAPL: Choose High Viscosity Skimmer or Density Skimmer
Minimal depth between base of well and product water interface: Choose Density Skimmer:

Selection Guide for Skimmer Pumps
Water-table fluctuations < 1m: Choose Fap Plus Pump;
Higher water-table fluctuations: Choose Fap Plus ZW pumps;
Limited compressed Air availability: Choose Pump on Demand (POD) pump;
Low LNAPL recharge to wells:  Choose Passive Skimmer Canisters

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