Retain DrainCatch basin inserts
The only good thing in stormwater is water.
Retain Drain is a patented stainless steel insert that sits under the grate you already have. It catches trash, sediment, oil and metals before parking lot runoff reaches local waterways.
- 304 stainless steel
- Assembles in 5 to 10 minutes
- 2024 Port of Seattle Sustainable Century Award
01The problem
Stormwater catch basins are the point of entry for debris and contamination that end up in our local waterways.
Every storm rinses the parking lot. Whatever is on the pavement rides the runoff into the nearest catch basin.
What a parking lot sheds
Field samples
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No. 01
Copper
Dust from brake pads
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No. 02
Zinc
Worn off tires
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No. 03
Oil and fuel
Drips from parked cars
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No. 04
Sediment
Grit, sand and fines
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No. 05
Leaves and needles
From trees and landscaping
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No. 06
Litter
Cups, wrappers and cigarette butts
Retain Drain removes copper, zinc, hydrocarbons and organic debris. It traps sediment and trash, too.
02How it works
Lift the grate and look inside.
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Layer 1 of 4
The grate you already have
It stays where it is. Retain Drain rests in the grate frame, right under it, so there's no construction.
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Layer 2 of 4
Laser-cut trash tray
A shallow stainless steel tray with rows of laser-cut slots. It holds trash, leaves and needles, and it slows the water so less sediment stays suspended.
- Trash
- Leaves
- Needles
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Layer 3 of 4
Coconut coir filter
A mat of 100% coconut coir traps hydrocarbons, copper and zinc. Spent filters go straight into the trash, since they aren't considered hazardous waste.
Mats in tan coir, green, navy and black
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Layer 4 of 4
Side panels and base plate
Modular 304 stainless steel. The filter sits on the base plate and shows through low windows in the side panels.
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Assembled
Assembles in 5 to 10 minutes with a couple of simple tools.
Then it sits in the catch basin you already have, right under your grate.
- 1Grate
- 2Trash tray
- 3Coir filter
- 4Side panels
- 5Base plate
Illustration · not to scale
Add-on
ADSORBIT Hula Bug
Adds oil protection when used with Retain Drain. ADSORBIT products remove up to twenty times their weight in oils, and we're an authorized ADSORBIT distributor.
03Proof
Tested, trialed and recognized.
450gal / min
Flow handled for 5 minutes with a full debris load, in independent testing by a local water district.
10× their weight
On average, trial filters trapped ten times their own weight in contamination over a monthly maintenance period.
Up to50%
Maintaining Retain Drain may cut vactor and vault servicing costs by as much as half over five years.
Test results and estimates from Stormwater Controls' July 2019 product launch.
“He's set himself apart for how much his drains can filter out.”
- 5-year warranty
- Manufacturer defect warranty, with proof of regular maintenance.
- 2024 winner Award
- Port of Seattle Sustainable Century Awards, Environmental Innovation category.
04Maintenance
Two checks, once a month.
Our standard protocol is to check each insert at least once a month. Here's what to look for.
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Check 1
Clear the trash tray
When you can no longer see the stainless steel perforated grate, or if the tray is holding water.
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Check 2
Swap the filter
When you can't see green. How often depends on your region, rainfall and contamination. Used filters go straight into the trash, since they aren't considered hazardous waste.
Retain Drain means less frequent vactor service, fewer vault system failures and longer cartridge filter life.
05Where it works
Based in Kitsap County. Launched along I-5.
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Home
Silverdale, Washington
We're a Kitsap County company, based in Silverdale.
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Launch · July 2019
Clackamas to Bellingham
Retain Drain launched at several major retail locations along the I-5 corridor, between Clackamas, Oregon and Bellingham, Washington.
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Trials
Costco warehouses
Trial tests at select regional Costco warehouses.
06Team
A small team from Kitsap County.
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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.
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Susan
Administrative Director
Spent 26 years as a marine pipefitter at Puget Sound Naval Shipyard. Volunteers with the Great Peninsula Conservancy and Puget Soundkeeper.
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Alexander Perry
Systems Administrator
Keeps our systems secure and reliable.
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Boomer
Environmental Mascot
Consecutive winner of Employee of the Year.
07Get pricing
Get pricing for your lot.
Tell us about your property and how many catch basins you have, and we'll put together pricing for your site.
(360) 340-5810Stormwater Controls LLC · Silverdale, Washington 98383