4–12 €
WC Net household drain treatment
Example enzymatic/biological treatment after water in the trap. Not an acid, not a stack unblocker.
When: After 1–2 L of water in the trap, a smell in your own home.
Not when: The stack, a total blockage, a smell in the stair.
Amazon Associates is live on the Italian edition only. No Amazon.com link here yet. A category example, not a model review.