Specify Genuine Gullywasher Brand ® Inserts

Key Benefits

• Independently Tested By Government Agencies
• No Misleading Laboratory Tests or Paid Testimonials
• Work with Experienced Professional Engineers

Key Decision Criteria

We offer the widest variety of catch basin inserts in the marketplace.   However, to assist you on finding the best design for your application; we want to offer some decision criteria.

The first decision is what type of containment(s) will be needed to be addressed - Trash, Sediment, and/or Oils.  The answer will direct us to a general capability our design will need.

The second decision is how sensitive the receiving body of water is (such as drinking water source, fish habitat, seawater outlet...).  The answer will direct us to how robust our design will need to be (Do you need to have maximum silt removal?)

The third decision is how long does the stormwater protection has to be in effect - short term, medium term, long term.  Contractors are on site just for a short duration; whereas maybe it takes more time for the protective vegetation to develop; whereas the airport manager or the strip mall owner are going to be there for the long term.

The First Decision - Trash, Sediment Only, or Oils & Sediment

• For solely trash removal, a loose web mesh or wire mesh works well.  Design should be easy to clean out and replace back in catch basin.
• For sediment only removal, a properly designed catch basin sump should do an adequate job in settling the silt and dirt.  Geotextiles pass solids initially for the first couple of weeks until the fabric starts plugging and allowing for greater separation.  The wire mesh baskets with sorbent pillows and socks offer the highest degree of sedimentation removal (6x than geotextiles).If the insert will lie into the incoming stream from other catch basins piped in series, the insert needs a solid wall design for preventing the collected material from washing out.
• For oils & sediment removal, a properly designed catch basin sump should do an adequate job in separating the silt, dirt, and oils; however, there will be a need for sorbents for picking up the oils.  Geotextile material will absorb hydrocarbons; but typically have a co-polymer adsorbent pouch for picking up the difficult hydrocarbons.   The wire mesh baskets with sorbent pillows and socks offer the highest degree of oil removal.  If any insert lies into an incoming stream from other catch basins piped in series, the insert needs a solid wall design for preventing the collected material from washing out.

The Second Decision - Receiving Body of Water

• Just watch out for highly sensitive and protected bodies of water.  We have proven designs that can offer 6 times more sediment removal or remove even oil sheen.   Sometimes it is required, sometimes not - depends on your site location.

The Third Decision - Short, Medium, or Long Term Use

There is a great commercial statement made in the 70's - "Either you can pay me now -or- pay me more later."  This all deals with the replacement costs of these designs.

• The self-standing geotextiles (DrainGuard and DrainWeb) are simple in design; but require complete replacement at each sump cleaning.  These are great for short term use.
• The geotextiles connected to metal grates (DrainGrate) are half the replacement costs than self standing; but have more expensive initial costs.  These can be retrofitted later into wire mesh basket inserts later on.
• The wire mesh inserts are less than a quarter of the replacement costs than the self-standing geotextiles; but are more expensive initially.  These designs have the best removal abilities.  These are great for medium to long term use.
• The solid metal inserts have the least expensive replacement costs.   However, they are the most expensive of the insert designs.

Catch Basin Design

It is to our best belief and decades' worth of experience that the standard catch basin itself offers an adequate separation potential for sediment and/or oils in non-sensitive site applications if:

• The outlet is placed somewhere along the side wall, well above the floor.
• The outlet is outfitted with a tee connection to allow for free and dispersed oils to develop a top floating layer.
• Floating sorbents can be used for capturing this top oil layer.
• The bottom section of the catch basin can be strictly for settling of silt and solids for periodic cleaning.