The Secret to Dissolving Cat Litter in Your Toilet Without Clogging


Cat owners often want to flush cat litter down the toilet for convenience. Scooping litter boxes daily and disposing of waste bags can be time consuming and messy. Flushing cat waste seems like an easy alternative. However, flushing regular clay cat litter causes major problems for plumbing and sewer systems. The clay does not dissolve and can build up to create clogs and blockages. Water treatment facilities are not designed to filter out this type of sediment. Even small amounts of clay can accumulate over time and lead to costly repairs. Understanding what dissolves in water and what can safely be flushed is key.


Clay Litters

Clay litters are made of absorbent clay granules, typically bentonite clay, that expand and clump together when wet. The clumping action allows solid waste to be scooped out while leaving clean litter behind. Popular traditional clay litters brands include Tidy Cats, Arm & Hammer, and Everclean.

Clay litters should never be flushed down toilets. When the clay granules come in contact with water, they expand into a heavy, dense mass that does not break down. This can lead to clogged drains and sewer damage. According to plumbing experts, flushing even small amounts of clay litter can create obstructions and sewer backups [1]. The clay can also accumulate in home plumbing pipes over time. Clay litters are designed for disposal in the trash, not for flushing.

Clumping Litters

Clumping litters are made of sodium bentonite clay that forms solid clumps when wet. The clumps trap urine and feces to contain odors. While it may seem convenient to flush clumping litter down the toilet, manufacturers strongly advise against doing so as the clumps can expand and clog pipes (source).

When clumping litter hits water, the clay absorbs the liquid and swells up. This expands into a solid mass that can stick to the sides of plumbing pipes, eventually accumulating to fully block drainage (source). Pieces of the clay clumps can also break apart into smaller chunks that make their way into sewer systems. This causes major blockages and damage that require expensive repairs.

Overall, it’s important to never flush clumping clay cat litters down the toilet. The clumps can rapidly expand, clog pipes and sewer systems, and lead to plumbing emergencies.

Alternative Litters

Plant-based and paper litters designed to be flushable are popular alternatives to traditional clay litters. These eco-friendly options break down in water and can be flushed down the toilet. Some of the top brands of flushable alternative litters include:

  • World’s Best Cat Litter – Made from whole-kernel corn, this natural litter is 99% dust-free and septic safe. It clumps well but can track outside the box. (
  • Swheat Scoop – Wheat-based litter that is biodegradable and flushable. May not clump as firmly as clay litters.
  • Feline Pine – Made from pine saw dust, this litter is very absorbent and masks odors well. It does not clump.

The main pros of flushable alternative litters are that they are more environmentally friendly and septic-safe compared to clay options. However, some plant-based litters may not clump as tightly or absorb odors as well. Paper litters also tend to be more expensive. Overall, flushable natural litters provide a good solution for cats using a toilet system.

Toilet Attachments

There are specialized toilet attachments like the Litter Genie that are designed to help dissolve and filter cat litter before flushing it down the toilet. The Litter Genie attaches right to the toilet and uses a patented sifting system to separate solid waste from liquid waste.

Here’s how the Litter Genie works to prevent clogs and dissolve cat litter in the toilet:

  • The used cat litter is poured into the top compartment, which contains a grate to sift out solid clumps.
  • Liquid waste passes through small holes in the bottom of the upper chamber into a lower compartment.
  • An antimicrobial cartridge helps control odors in the lower chamber where liquid accumulates.
  • When ready to flush, a sealed packet of organic additives is dropped into the lower compartment to help break down litter and waste.
  • Then the flush handle is pumped to swirl the liquids and flush them down the toilet.

By filtering out the solid clumps first, the Litter Genie allows the cat litter to dissolve in the liquids before flushing, helping prevent clogs in pipes. The additives assist in dissolving any remaining small litter particles. Models like the Litter Genie Plus have specialized cartridges to optimize litter dissolving. With routine cleaning, these types of sifting toilet attachments can allow cat owners to flush waste without plumbing issues.


Septic Systems

Cat litter should never be flushed into septic systems. The clay in traditional cat litter does not break down and can build up inside septic tanks, clogging inlet pipes and damaging expensive pumps and components ( Even clumping and “flushable” litters contain silica gel, bentonite clay, and other ingredients that don’t decompose. These can solidify into cement-like masses inside tanks.

Flushed cat litter that makes it past the septic tank will clog the leach field. The leach field is an underground area filled with perforated pipes that allow wastewater to drain away. Cat litter particles will get stuck in the perforations, preventing proper drainage. Litter can also bind together soil particles, reducing the soil’s ability to absorb and filter liquid. Septic system failure is expensive to repair, so cat litter should always be disposed of in the trash rather than flushed (

Water Treatment

Flushing cat litter down the toilet can have a significant impact on wastewater treatment facilities. Most cat litter is designed to clump when wet and does not dissolve easily in water. This means that clay litters and other non-flushable types can overwhelm sewage systems by clogging pipes, filters, and equipment at treatment plants ( The plastic liners in clumping clay litters are also problematic, as they do not break down and can pass through treatment to pollute waterways.

The environmental impact continues even after the waste leaves the treatment plant. Cat feces can contain toxoplasmosis and other pathogens that are not fully removed by standard wastewater treatment. These contaminants are then discharged into rivers, lakes, and oceans where they pose risks to wildlife and human health. Even dissolved or degraded cat litter contributes to nutrient pollution that leads to algal blooms and oxygen depletion. With over 74 million owned cats in the United States producing 30+ pounds of waste per year each, the cumulative effect of flushing litter on the environment is substantial (

Pipes and Plumbing

Flushing cat litter down the toilet can lead to clogged pipes and plumbing issues. The clay, grit, and other materials in cat litter do not dissolve easily and can accumulate in pipes over time. Small particles of litter can clump together and get lodged in bends and joints in pipes, causing blockages.

A buildup of cat litter in pipes can restrict water flow, leading to backups and flooding. The drain pipe connecting the toilet to the main sewer line is especially prone to clogs from cat litter. Pieces of litter can get caught in this narrow pipe and create a mass that blocks the flow of waste.

Consulting with a plumber before deciding to flush cat litter regularly is advisable. A plumber can assess your home’s plumbing system and determine if it can handle cat litter being flushed. Older pipes that have buildups of mineral deposits or debris may be more susceptible to clogging from cat litter.

To avoid expensive plumbing repairs, it’s best not to flush clay or clumping cat litter down the toilet. Scooping out solid waste and disposing of litter properly is the safest option. If you do choose to flush litter, using a lightweight, septic-safe product can help minimize risks.


Alternatives to Flushing

While some cat litters claim to be flushable, flushing litter down the toilet can lead to clogged pipes, septic tank issues, and problems at wastewater treatment plants. To avoid these issues, pet owners have several alternative disposal methods to consider.

The most common and recommended method is to simply throw away solid cat waste in the trash. Scoop out urine clumps and stool daily into a bag that can be tightly sealed before disposing of it with your regular garbage (The Best Way to Dispose of Cat Litter). Use litter deodorizers or baking soda in the bag to help control odors. Take the trash out frequently to limit smell in your home.

For a more eco-friendly approach, some pet owners compost cat waste or bury it underground (How to Sustainably Dispose of Cat Litter: Eco-Friendly Ways). However, check local regulations first, as some areas prohibit this. Make sure to compost or bury waste away from vegetable gardens and water sources.

You can also consider switching to a natural cat litter made of pine, wheat, or corn. These alternative litters are often compostable or flushable. But be sure to verify flushable claims before disposing of any cat litter down the toilet.


Flushing regular clumping or clay cat litter down the toilet can create major plumbing issues, as it does not properly dissolve and can clump inside pipes. Litter made from natural materials like wood, paper or wheat are safer options if you must flush, but they still place a burden on water treatment facilities. The tiny plastic beads in crystal litters also do not break down, making their way into the environment.

The best solution for regular litter disposal is to use biodegradable litters and dispose of solid waste directly in the trash. Compostable litters made from plant materials can be scooped into compost piles after removing any solid clumps. This keeps non-biodegradable particles out of water supplies and prevents plumbing and septic system damage.

Disposing of cat litter properly protects your plumbing, municipal water treatment facilities, and the environment. Consider switching to a greener, compostable litter or using alternatives like litter boxes with disposable tray liners to make regular waste disposal simple and eco-friendly.

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