Detail A
Laser-cut trash tray
Trash, leaves and organic debris stay on the tray. The tray also slows the water, which lowers turbidity and reduces total suspended solids (TSS), so less sediment stays suspended.
- Trash
- Leaves
- Organic debris
Retain Drain Catch basin insert
The only good thing in stormwater is water.
A patented stainless steel insert that sits under the grate you already have. It holds back trash, sediment, oil and metals before parking lot runoff reaches local waterways.
- Material
- 304 stainless steel
- Filter
- 100% coconut coir
- Fit
- Under your grate
- Assembly
- 5 to 10 minutes
- Warranty
- 5 years
- Status
- Patented
Stormwater catch basins are the point of entry for debris and contamination that end up in our local waterways.
Every storm washes oil, grit and litter off a parking lot and into its catch basins. Retain Drain catches them right at the inlet.
| Pollutant | Typical source |
|---|---|
| Hydrocarbons | Oil and fuel drips |
| Copper | Brake pad dust |
| Zinc | Tire wear |
| Sediment | Grit and fines |
| Organic debris | Leaves and needles |
| Trash | Cups, wrappers, cigarette butts |
Four parts that sit under your existing grate.
Retain Drain is patented, modular and made of 304 stainless steel. It consists of a base plate, side panels and a laser-cut trash tray, with a coconut coir filter inside.
- 10Your existing grateStays where it is. Retain Drain sits right under it.
- 20Laser-cut trash traySits in the opening. Holds trash and leaves and slows the water.
- 30Side panels304 stainless steel. The wide flange rests in the grate frame, and low windows show the filter.
- 40Coconut coir filter100% coconut coir. Traps hydrocarbons, metals and sediment.
- 50Base plate304 stainless steel. The filter sits on it.
- Add-onADSORBIT Hula BugAdds oil protection when used with Retain Drain. ADSORBIT products remove up to twenty times their weight in oils.
Install in three steps.
Retain Drain fits inside the catch basins you already have, under the existing grate. The modular parts assemble in 5 to 10 minutes with a couple of simple tools.
Lift the grate.
Pull the existing grate out of its frame and set it aside.
Set the insert in the frame.
Lower Retain Drain into the catch basin. Its wide flange rests in the grate frame.
Drop the grate back.
The grate goes back on top, right where it was. No construction needed.
The tray takes the trash. The filter takes the rest.
Detail B
Coconut coir filter
Below the tray, the water runs through the 100% coconut coir filter. Add an ADSORBIT Hula Bug for extra protection against oil.
- Hydrocarbons
- Copper
- Zinc
- Sediment
Tested with a full debris load.
Results from independent testing and trial filters at the July 2019 launch, and the warranty behind every insert.
| Test | Condition | Result |
|---|---|---|
| Flow capacityTest result | Independent testing by a local water district, with a full debris load. | 450gal/min for 5 minutes |
| Filter loadingTest result | Trial filters, over a monthly maintenance period. | 10× their weight in contamination, on average |
| Servicing costEstimate | Maintaining Retain Drain over five years. | up to50% Regular maintenance may cut vactor and vault servicing costs by as much as 50% over five years. |
Test results and estimates from Stormwater Controls' July 2019 product launch.
Warranty
5years
Manufacturer defect warranty, with proof of regular maintenance.
Recognition
2024
Port of Seattle Sustainable Century Awards
Winner, Environmental Innovation category.
Press
“He's set himself apart for how much his drains can filter out.”
Check each insert at least once a month.
That's our standard protocol. At each visit, check whether you can still see the tray's perforated steel and whether you can still see green.
- Less frequent vactor service
- Fewer vault system failures
- Longer cartridge filter life
At least once a month.
When you can no longer see the stainless steel perforated grate, or if it's holding water.
If you can't see green. How often depends on your region, precipitation and contamination.
Straight into the trash. Used filters aren't considered hazardous waste.
The 5-year warranty requires proof of regular maintenance.
Filter mats come in tan coir, green, navy and black.
- Tan coir
- Green
- Navy
- Black
From Silverdale to the I-5 corridor.
We're a Kitsap County company, based in Silverdale. Retain Drain launched in July 2019 at several major retail locations along the I-5 corridor, with trial tests at select regional Costco warehouses.
| Item | Location | Note |
|---|---|---|
| Headquarters | Silverdale, Washington 98383 | A Kitsap County company |
| Launch, July 2019 | Several major retail locations along the I-5 corridor | Clackamas, OR to Bellingham, WA |
| Trials | Select regional Costco warehouses | Trial tests at launch |
The people behind Retain Drain.
Ken Perry
Founder & Managing Director
Entrepreneur, patent holder and developer with 30 years in facility management. His first company, founded in 1990, served large industrial and commercial properties, including parking lots. A lifetime Kitsap County resident and Western Washington University graduate.
Susan
Administrative Director
Spent 26 years as a marine pipefitter at Puget Sound Naval Shipyard. Volunteers with the Great Peninsula Conservancy and Puget Soundkeeper.
Alexander Perry
Systems Administrator
Keeps our systems secure and reliable.
Boomer
Environmental Mascot
Consecutive winner of Employee of the Year.
Get pricing for your site.
Tell us about your property and how many catch basins you have. We'll put together pricing for your site.
- Phone
- (360) 340-5810
- Office
- Silverdale, Washington 98383
- Price list
- See the price list
- Social