By SemperScreen®. We own residential and commercial real estate properties across the United States, and we built the permanent sink screen for our own buildings before we sold it to anyone else.
To stop food going down the sink drain and keep drains clear, keep a screen over the drain opening, scrape plates into the trash or compost, and never pour grease down the sink. EPA reports that grease is the most common cause of reported sewer blockages, at 47 percent, because it hardens and blocks flow.1 A screen that can't be removed, especially in a rental, keeps catching food scraps even on days the scraping habit slips, guaranteeing that you prevent buildup, prevent drain clogs and keep drains flowing.
What happens when food goes down the sink drain?
Food that goes down the sink drain either stays in your pipes or travels on to the sewer. In the pipes, the grease that comes with it solidifies, narrows the line and eventually blocks flow.1 Clearing a blocked line means a service call, at $250+ per call, and for property teams drain clogs are one of the top three maintenance ticket categories.
In the sewer, it's still wasted food. EPA's Wasted Food Scale places sending food down the drain in its least-preferred tier, alongside landfilling and incineration.2 The scale ranks environmental impact, and EPA notes it doesn't consider economic and social factors.
Some foods cause far more trouble than others, and our list of the top 10 foods that cause clogged drains explains why. For the wastewater side, see how to reduce food waste going down the drain and into wastewater systems.
How do you stop food from going down the sink drain?
To prevent food buildup in kitchen drains, work through these seven strategies in the order we'd put them in a building. The first one does most of the work. New to screens? Start with what a sink screen is and how to choose one.
Strategy #1: Install permanent sink screens (the foundation)
The simplest strategy does the most work: stop food at the drain opening, before it enters your plumbing.
Pop-out screens only protect the drain while they're in it. Once one comes out for emptying and doesn't go back, food goes straight down. A garbage disposal grinds food smaller and sends it down the drain anyway.
The permanent solution: the SemperScreen® permanent sink screen is the only non-removable permanent sink screen. It fits standard 3½" drains and installs in ~15 minutes per drain, retrofit, no plumbing modifications. It stops food waste at the sink down to grains of rice.
Why this works:
- Screen aperture of 0.08 in (2.0 mm), in polished stainless (304 stainless steel)
- Occupants can't remove it, so it can't go missing
- Cleaning is simple: "Just scoop it out!"
- Tested and COMPLIED with ASME A112.18.2-2020 / CSA B125.2-20 (see the test reports)
- Lifetime residential warranty. For rentals, see the commercial warranty.
Real-world results: Read up on the origin of the permanent sink screen and how it saved a 33-unit apartment investment in Los Angeles, CA.
Payback: within the first prevented service call — typically 30–90 days. Property teams can run the numbers for their own building in the savings calculator.
Strategy #2: Compost food scraps (eliminate the source)
Composting keeps food waste out of drains entirely while providing environmental benefits.
On EPA's Wasted Food Scale, composting ranks above sending food down the drain, which sits in the least-preferred tier.2
For property managers:
- Provide compost bins in units or common areas
- Partner with local composting services
- Include composting instructions in move-in packets
What can be composted:3
- Fruit and vegetable scraps
- Coffee grounds and paper filters
- Tea bags (remove staples)
- Eggshells
- Bread and grains
What cannot:
- Meat and bones
- Dairy products
- Oils and grease
- Pet waste
Strategy #3: Eliminate garbage disposals
This one runs against habit, so we wrote up the full case for why property owners are eliminating garbage disposals. Landlords can check whether a garbage disposal can be removed from a rental first.
Why disposals cause problems:
- Grinding makes food smaller and still sends it down the drain, the pathway EPA's Wasted Food Scale ranks in its least-preferred tier2
- Water use: 15–60 seconds per use
- On a septic system, read garbage disposals and septic systems before you decide
The better approach: Remove disposals during unit turns and install SemperScreen® permanent sink screens. You retire the disposal's upkeep and water use, and food scraps stop at the sink. What to install after removing a garbage disposal compares the options, and how to change a garbage disposal to a regular drain covers the conversion.
SemperScreen® recommends that you always refer to local building codes when modifying a building's plumbing system.
Strategy #4: Implement grease management protocols
Fats, oils, and grease (FOGs) should never go down drains, and a screen can't stop them, because they reach the drain as a liquid. Guidance written for commercial kitchens puts it plainly: don't pour cooking grease down the drain, and don't use the sink to dispose of food scraps.4
For tenants:
- Never pour grease down drains
- Let FOGs cool and solidify
- Scrape into sealed containers
- Dispose in regular trash
For property managers:
- Include FOG disposal instructions in lease agreements
- Provide small grease collection containers
- Post reminder signs near kitchen sinks
- Educate during move-in walkthroughs
Why grease is so problematic: FOGs start as liquids but solidify in pipes, reduce how much the pipe can carry and eventually block flow.1
Strategy #5: Use enzyme-based preventive treatments
Some owners add a monthly enzyme drain treatment as routine maintenance.
Best practices:
- Follow the product label
- Use overnight (when drains aren't in use)
- Use it alongside the other strategies, never in place of them
Important: Enzyme treatments are a maintenance step. For a line that's already blocked, or if you're unsure, call a professional plumber.
Strategy #6: Install grease traps (for high-volume kitchens)
While less common in residential properties, grease traps matter most in commercial kitchens and any property with high food preparation volume. A growing number of local sewer authorities set grease rules for food service establishments, including the use of interceptors.1
When to consider:
- Properties with shared commercial kitchens
- Senior living facilities with dining services
- Student housing with communal cooking areas
How they work: Grease traps hold grease on site so it doesn't enter the sewer, and they need servicing at regular intervals.1
Running a commercial kitchen? See how to cut grease interceptor pump-out frequency at the sink and commercial garbage disposal bans and what to install instead.
Strategy #7: Educate tenants (but don't rely on it)
Tenant education helps, but it's unreliable as a sole strategy.
Workplace safety uses the same logic. NIOSH's hierarchy of controls ranks engineering controls above administrative controls such as training, because they work without significant human interaction.5 And the North Carolina guidance that tells kitchen staff not to remove drain screens concedes that the success of dry clean-up "is dependent upon the behavior of the employee."4
What to teach:
- Never put these down drains: coffee grounds, eggshells, pasta, rice, grease, bones
- Always scrape plates into trash before rinsing
- Use SemperScreen® permanent sink screens properly (scoop out debris regularly)
- Report slow drains immediately
Reality check: Even with excellent education, tenants will make mistakes. That's why the physical layer matters: a permanent sink screen that can't be removed keeps catching food scraps whether or not anyone remembers the training.
Include in:
- Move-in packets
- Lease agreements
- Posted signs in kitchens
- Annual reminders
Which strategy should you start with?
Start with the screen, because it keeps working on days the scraping habit slips. Then layer in the rest.
Foundation: SemperScreen® permanent sink screens in every unit.
Supporting actions:
- Decide on garbage disposals at unit turns (strategy #3)
- Provide composting options
- Implement grease management protocols
- Optional enzyme maintenance
- Ongoing tenant education
Why layered protection works: Each strategy addresses a different part of the problem. The permanent sink screen catches the food scraps that reach the drain. Composting reduces what tenants are tempted to put down drains. Grease protocols handle FOGs.
Real-world implementation
Phase 1 (Immediate):
- Install SemperScreen® permanent sink screens in all units during turns
- Remove garbage disposals as they fail
- Distribute FOG disposal instructions
SemperScreen® recommends that you always refer to local building codes when modifying a building's plumbing system.
Phase 2 (1-3 months):
- Establish composting program
- Add enzyme maintenance if you use it
- Refresh tenant education
Phase 3 (Ongoing):
- Monitor drain call frequency
- Track cost savings (see how reducing water waste in multifamily properties impacts NOI)
- Refine protocols based on results
Taking action
Pick the layer you can put in place this week. For most kitchens, that's the screen.
For your own kitchen: start with the SemperScreen® permanent sink screen. Want the mechanism first? See how the permanent sink screen works. To buy locally or through a plumber, use Find a Store or Plumber.
For rental and property teams: We know you have at least one drain that keeps clogging (we have experience with those). Contact us and let's discuss testing our permanent sink screens in those bad drains.
Frequently asked questions
Does plumbing code say a sink screen has to be removable?
Where the International Residential Code is adopted, a sink in a one- or two-family home needs a device at its waste outlet that restricts the clear opening, and the code names a crossbar or other device among the options. The section doesn't say that device has to be removable.6 SemperScreen® recommends that you always refer to local building codes when modifying a building's plumbing system.
My kitchen sink is already clogged with food. What should I do first?
Clear the blockage first, because a screen protects a clear line and won't clear what's already in it. If the sink has a garbage disposal, start with our guide to the best way to unclog a disposal. Once the line runs clear, a SemperScreen® permanent sink screen keeps new food scraps out.
Can tenants or guests remove a SemperScreen® permanent sink screen?
No. The screen is permanently fixed to the body and can't be removed, displaced or omitted by occupants, and that's the protection. The assembly still installs and services with standard tools, so a plumber can work on the drain when needed.
Someone in my home keeps putting food down the sink. What can help?
A permanent sink screen stops food scraps at the drain opening no matter who is at the sink. If a garbage disposal is involved, read should you disconnect the garbage disposal for someone with dementia before you decide.
References
- U.S. Environmental Protection Agency, Office of Water. "National Pretreatment Program (40 CFR 403): Controlling Fats, Oils, and Grease Discharges from Food Service Establishments." EPA-833-F-12-003. September 2012. Retrieved from https://www.epa.gov/system/files/documents/2021-07/pretreatment_foodservice_fs.pdf
- U.S. Environmental Protection Agency. "Wasted Food Scale." Sustainable Management of Food. Accessed September 15, 2026. Retrieved from https://epa.gov/sustainable-management-food/wasted-food-scale
- U.S. Environmental Protection Agency. "Composting At Home." Retrieved from https://www.epa.gov/recycle/composting-home
- North Carolina Department of Environment and Natural Resources, Division of Pollution Prevention and Environmental Assistance. "Grease Goblin" FOG Best Management Practices, DPPEA-FY00-08, as published in the Salisbury-Rowan Utilities FOG Control Program. Accessed September 15, 2026. Retrieved from https://salisburync.gov/Government/Salisbury-Rowan-Utilities/FOG-Program
- National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention. "Hierarchy of Controls." Accessed September 15, 2026. Retrieved from https://www.cdc.gov/niosh/hierarchy-of-controls/about/index.html
- International Code Council. International Residential Code, § P2714.1, Sink waste outlets. Same section text in the 2018, 2021 and 2024 editions as adopted in Texas. Accessed September 15, 2026. Retrieved from https://up.codes/s/sink-waste-outlets
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