can this be used to deal with drain flies?

Not sure to be honest, but if one imagines that 'flies' normally appear when there is rotting/decomposing organic material - then once this is removed in whatever format, then again, one imagines that the 'fly' issue should also disappear. But then nature is a strange animal???

Is it safe to use with a macerator? The bath pipe to the macerator is blocked.

Have not used the product in the way suggested, however macerators to my knowledge are made from sturdy plastics and metal blades (likely steel) which would be similar to baths and waste-pipes etc. so the product is likely to work just as well here...? The biological material does not appear harsh enough to diminish such materials - at least not those in my home? Thanks.

A capful dose will just sit overnight in the U trap. Mine is clear. What dose to reach the slow draining pipes beyond?

I followed the instructions on the bottle and put half the contents down. I did this twice over a few days while not using the sink and it made no difference at all ☹️

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Knock Out Biological Drain Treatment, 1 Litre

Product ID: 57372264

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Details

Brand
Barrettine
Scent
Unscented
Item weight
1 Grams
State of matter
Liquid
Product benefits
Eco friendly

🌱Eco-friendly

🦠Bacteria blend

🛠️1 Litre capacity

Description

🌟 Keep Your Drains Happy, Sleep Tight!

EASY CLEANUP - Spills? Just wipe them up—no mess, no stress!
SAFE FOR HOME USE - No corrosive chemicals—safe around kids and pets.
OVERNIGHT SOLUTION - Just a capful overnight, and wake up to clear drains!
ECO CONSCIOUS MAINTENANCE - Keep your drains clear without harming the environment.
POWERFUL BACTERIAL ACTION - Special blend of friendly bacteria tackles blockages effortlessly.

The Knock Out Biological Drain Treatment is a 1-litre eco-friendly solution designed for regular maintenance of your drains. Utilizing a special blend of friendly bacteria, it effectively breaks down blockages without the use of harsh chemicals, ensuring a safe and clean environment for your home.

Specifications

Product Name	Biological Drain Treatment, 1 Litre
Units	1000.0 millilitre
Brand	Barrettine

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