how much needs to be used at a time?

All of it for heavily blocked outdoor drains.

Spear jackson heavy duty sink and drain unblocker gel -is this sulphuric acid

Not that I remember re sulphuric acid but the product was not as good as I was hoping.

I think i may have candle wax far down my drain, will this remove it please?

Probably. Boiling hot water should work, also. I'd try that first as it's free.

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🚀 Clear your drains, clear your day—power unblocker gel that works while you rest!

RAPID ACTION GEL - Clears hair, grease, soap & food deposits in 3 hours.
TRUSTED HERITAGE - Backed by 250+ years of Spear & Jackson innovation.
LONG LASTING FRESHNESS - Sink freshener element keeps drains smelling brand new.
EFFORTLESS BLOCKAGE REMOVAL - No drain snake needed—just pour and relax.
VERSATILE INDOOR OUTDOOR USE - Perfect for kitchen, bathroom, and exterior drains.

Spear Jackson Heavy Duty Sink and Drain Unblocker Gel is a 5L powerful gel designed to dissolve tough blockages caused by hair, grease, soap, and food deposits. Safe for all pipe types and effective indoors and outdoors, it works within 3 hours (preferably overnight) to restore smooth drainage and freshen your sink. Trusted for over 250 years, this gel offers a hassle-free, fast-acting solution to keep your drains flowing freely.

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