Powerful Drain Cleaner & Unblocker l 1KG Caustic Soda | Fast-Acting, Heavy-Duty Sink & Drain Cleaner | Strong & Effective | The Original & Best l Works 3x Better Than Bleach (Packaging Varies)

This product is so good at cleaning smelly sinks and drains. I am currently cleaning out a grimy aquaroll. I will be cleaning out caravan waste pipes with it soon. Very prompt delivery. Well packaged. This product does what it says and more. Try to remember to wear disposable gloves, I always forget. It is really strong stuff. Read the label for safe use. Really good value, open safety cap and pour, easy. Keep out of reach of children.

Very powerful. Must take precautions though with hands, and masks, but cleared my external drain first time.

Cleared blockage in sink no problem, does exactly what it says on the bottle…

Clears drains fast, use with caution and it does what its meant to. Good price when I purchased and quality is as its meant to be. Clears blockages fast for most household situations good effective product.

When members of the family have a tendency to allow all sorts of rubbish to be flushed out of the kitchen sink, you need something good to clear the drain when it gets blocked. I've often used caustic soda so bought this specifically for that purpose. Just pour the crystals over the muck blocking the drain and leave for an hour or so and then wash away.Also good for making soap if that's your thing (make sure you know what you're doing).

Not powerful enough for the drains according to measurements - used the whole bottle in the end.

Unblocked the sink in around a hour - it works.

I'm unsure of the various quality levels of caustic soda, if indeed there are any, but this product performed the task of cleaning / clearing drains very well.