Stormwater Catch Basin Inserts

Drain Guard Frequently Asked Questions

Stormwater catch basin inserts are one of the most commonly used BMPs on construction sites, work sites, parking lots, and sediment removal areas. Sometimes referred to as a witch's hat or drain guard, storm drain inlet filters fit under grates to clean water as it flows into the drain. Commonly asked questions regarding stormwater catch basin inserts are below. For more information on these storm drain products, please choose your model below:


Frequently Asked Questions

1. What fabric is used in the catch basin design? Answer

2. What pollutants can they remove from stormwater?

Answer
3. How are storm drain inlet filters installed? Answer
4. How long do they last? Answer
5. Can they be used on circular drains? Answer

x-tex fabric1. What fabric is used in the catch basin design?
Stormwater catch basin inserts are typically made from a geotextile fabric or geotextile-like fabric material. While some storm drain products use an 8 oz. nonwoven fabric, many of the drain guards are made from a fabric known as X-Tex.

X-Tex is a recycled fabric capable of absorbing oil, hydrocarbons, petroleum, and more. It is typically used in locations looking to remove oil as well as sediment or debris.


Questions about storm drain products? We can help! Call GEI Works at +1-772-646-0597.


2. What pollutants can they remove from stormwater?
Depending on the model, stormwater catch basin inserts help remove sediment, silt, hydrocarbons, debris, and heavy metals. Each model and their uses can be seen below:

Model What It can Remove
Oil & Sediment Dirt, Silt, Sediment, Sand and some Hydrocarbons
Oil & Sediment Plus Silt, Sediment, Oil and Grease (includes X-Tex anti-microbial strips to help filter out and absorb oil)
Trash & Debris Leaves, Silt, Paper, Dirt
Oil & Sediment Ultimate Oil, Grease, Hydrocarbons, Silt, Debris
(includes X-Tex filter strips both inside the catch basin and along the bottom of filter)
Heavy Metal Rubidium, Lead, Zinc, Calcium, Potassium, Cesium, Silver, Mercy, Aluminum, Magnesium, Chromium, Iron, Copper and more.

3. How are storm drain inlet filters installed?
Please view the information below as a general guide for installing catch basin inserts in a street drain.

  1. Remove the grate.
  2. Clear the top area/edge of debris or sediment.
  3. Place the guard into the drain. (If your are using a high capacity model, retainers will be required in order to keep the drain guard in place.)
  4. Replace the grate so that the fabric is pinched between the grate and concrete.
  5. Cut away any excess fabric.

View more Drain Guard Installation Information.

Questions about stormwater catch basin inserts? We can help! Call our team at +1-772-646-0597 or submit a form.

storm drain inlet filters4. How long do they last?
On average, drain guards will last anywhere from 3-6 months. However, each site has different conditions. In areas where heavy flows/pollutants are present, a drain guard may have a reduced life expectancy. All guards should be inspected on a regular basis.

    Signs the guard needs to be replaced:
  • 6" of sediment has collected in the guard
  • Oil is floating freely, not being absorbed

5. Can they be used on circular drains?
Yes! Although the securing part of the drain guard is square, it is designed in a generic sizes to accommodate the requirements of multiple different drains. As long as the diameter of your drain does not exceed the size of the top square, the guard can be used the same way as with rectangular drains. Just cut away any excess fabric that may cause a disturbance to the surrounding area.

Questions about the catch basin design? Call our team at +1-772-646-0597 or submit a form.