Unlike acidic drain cleaners which "burn" through clogs, sodium hydroxide works by and hydrolysis .
This destructive power is also why you must treat it with awe. Sodium hydroxide does not discriminate between a hairball in a shower drain and the protein in your skin. A single crystal can cause a third-degree chemical burn. Fumes can scar the cornea. It reacts violently with aluminum pipes (producing explosive hydrogen gas) and even with the moisture in the air. drain cleaner sodium hydroxide
It is highly effective at breaking down the proteins and carbohydrates found in hair, food particles, and scum. Unlike acidic drain cleaners which "burn" through clogs,
The reaction between lye and water can produce fumes. Ensure the area is well-ventilated. A single crystal can cause a third-degree chemical burn
Sodium hydroxide is highly alkaline. If used according to directions (flushed with plenty of water), it is significantly diluted by the time it reaches the sewage treatment plant. It does not bioaccumulate like some harsh chemicals, but in high concentrations, it can disrupt the bacterial balance in septic systems.
While generally safe for PVC and most metal pipes, the high heat generated can occasionally soften or deform very old, thin-walled plastic pipes if used in excess. Never use sodium hydroxide in standing water if you plan to use a plunger afterward, as the splash-back is extremely dangerous. Step-by-Step Usage Guide