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Stormwater Catch Basin Inserts

Frequently Asked Questions (FAQ)

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, these inserts fit under grates to filter water as it flows into the drain. Commonly asked questions regarding these inserts can be seen below. For more information on these drain guards, please choose your model below:

stormwater drain guard

Curb Guard Insert

catch basin inserts

Oil & Sediment
Catch Basin Insert

adjustable drain guard

Adjustable Frame


1. What fabric is used to make the drain guards? Answer

2. What pollutants can they remove from stormwater?

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


1. What fabric is used to make the drain guards?

Drain Catch Basin Inserts are typically made from a geotextile fabric or geotextile-like fabric material. While some drain guards will use an 8 oz. nonwoven fabric, many of the Ultra-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.

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Questions? We can help! Call our team at +1-772-646-0597.

2. What pollutants can they remove from stormwater?

Depending on the model, catch basin inserts will be able to 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: View Spec Sheet

3. How are they 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

  6. Questions? We can help! Call our team at +1-772-646-0597 or submit a form.

View more Installation Information

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4. 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, the guards may feature 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

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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? We can help! Call our team at +1-772-646-0597 or submit a form.