Dissolving existing crystals is only half the battle. Without prevention, they will return in 4–8 weeks.
When urine sits in a P-trap, the urea breaks down into ammonia and carbon dioxide. This raises the pH, causing minerals to precipitate out of the liquid and weld themselves to the porcelain and PVC. Over months, this creates a plug that looks like a gray, crunchy stalagmite.
Once you have cleared the urinal, use these tips to prevent them from returning:
To dissolve urine crystals (uratic salts) in urinals, you must use acid-based or enzymatic cleaners specifically designed to break down non-soluble uric acid. Traditional soaps and detergents are ineffective because they cannot penetrate the hard mineral bond of these crystals. Top Recommended Methods
Urinal Cleaning: How to Get Rid Of Uric Scale & Smell in Toilets
To dissolve urine crystals (uric scale) in urinals, you must enzyme-based cleaners specific descaling acids
because traditional soaps and detergents are ineffective at breaking down these hardened mineral deposits. Citron Hygiene Effective Methods to Dissolve Crystals Choose a method based on the severity of the buildup: Enzyme-Based Cleaners (Best for general use): how to dissolve urine crystals in urinals
These biological cleaners contain living organisms that "digest" the uric acid crystals and destroy odor-causing bacteria. How to use:
Blot up any standing urine first. Saturate the affected area with the cleaner and let it sit for at least 10 minutes. For old, dried deposits, cover the area with plastic wrap for 24–48 hours to keep it moist and active. Commercial Descalers (Best for slow drains):
For blockages deep in the "p-trap," use heavy-duty descalers like Javelin Urinal Treatment How to use:
Pour roughly 16 oz (or as directed) into the urinal and allow it to sit overnight before flushing several times in the morning. Acidic Home Remedies (Best for minor scaling):
Pour roughly 250ml of white vinegar into the urinal container or drain and leave it to work overnight. Citric Acid:
A gentler alternative to vinegar that is effective for minor scaling but may struggle with stubborn, thick deposits. Baking Soda & Vinegar: Dissolving existing crystals is only half the battle
Mix 1 cup of vinegar with 1 cup of baking soda for a fizzing action that can help loosen surface stains. Citron Hygiene Specialized Product Options
If standard cleaning fails, consider these professional-grade solutions:
Urinal Cleaning: How to Get Rid Of Uric Scale & Smell in Toilets
Urine crystals (uratic salts) form when uric acid in urine reacts with oxygen and hardens into alkaline deposits, often solidifying "like cement" in the P-trap and drain lines. To dissolve these crystals effectively, you must use specialized chemical agents that can break down the salt's molecular structure. 1. Select the Right Dissolving Agent
Standard soaps and detergents are ineffective against hardened uric scale. Use one of the following specialized types:
Enzymatic Cleaners: These contain biological microorganisms that "eat" the uric acid crystals and destroy odor-causing bacteria. Examples include urineFREE. Before learning how to dissolve them, you need
Acid-Based Descalers: Stronger chemical solutions like A-Salt (urea hydrochloride) or Crete (heavy-duty descaler) aggressively cut through calcium, lime, and uric salts.
Natural Alternatives: For minor scaling, distilled white vinegar or citric acid can be used as more gentle, eco-friendly acidic agents. How to get rid of urine odours in urinals?
Before learning how to dissolve them, you need to understand the enemy. Urine contains urea, which breaks down into ammonia, as well as uric acid, creatinine, and various salts. When urine sits on a porcelain surface or in the P-trap, water evaporates, leaving behind concentrated mineral salts. Over time, these salts crystallize into hard, rock-like layers.
The Chemistry: Urine crystals are alkaline (high pH). Most commercial bathroom cleaners are either neutral or alkaline, which is why they fail. To dissolve urine crystals, you need an acidic solution.
Dissolving urine crystals is not just about aesthetics. Crystal buildup harbors ammonia-producing bacteria that release volatile organic compounds (VOCs). These compounds cause the characteristic "urine smell" that no amount of air freshener can mask. More importantly, biofilm inside crystal deposits can contain E. coli, Klebsiella, and other pathogens that become aerosolized when the urinal flushes.
Regular descaling (every 3–6 months) eliminates this bacterial reservoir.
| Product | Why It Fails | | --- | --- | | Bleach | Bleach is alkaline. It reacts with ammonia in urine to create toxic chloramine gas. It does not dissolve crystals. | | Ammonia-based cleaners | These add more alkalinity, making crystals harder. | | Boiling water | Can crack porcelain urinals due to thermal shock. | | Hard scrub brushes | Only remove surface dust; they cannot penetrate hardened crystal layers. |
Most urinal crystals are struvite + calcium phosphate due to urease-producing bacteria.