Is this size enought to handle three separate drains?

Nope. You should use the entire bottle for each drain

is this for plastic pipes?

A word of caution: Products such as Liquid Plumr and Drano are strong enough to break up clogs in your pipes such as hair, food or grease, and they do work in some instances, but you should use caution when pouring them down the drain. Liquid Plumr and Drano are chemically designed to eat away at whatever is clogging your pipes, which can result in damaging plastic or even metal pipes. https://www.superiordrain.com/are-liquid-drain-cleaners-harmful-to-pipes.

Is it necessary to wear a mask when using?

I had no reason to wear a mask - I am sensitive to smells and this was fine - of course, I didn't stick my head down in the sink! Just squirted it in the drain - and followed the directions. its a good product!

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Liquid-Plumr Pro-Strength Hair Eliminator Gel Clog Remover, Hair Clog Remover and Drain Opener, Safe for All Septic Systems and Pipes, 16 fl. oz. Bottle

Liquid-Plumr Pro-Strength Hair Eliminator Gel Clog Remover, Hair Clog Remover and Drain Opener, Safe for All Septic Systems and Pipes, 16 fl. oz. Bottle

Product ID: 1667764

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Details

Brand
Liquid-Plumr
Scent
Unscented
Item Weight
1.31 Pounds
State of matter
Liquid
Product Benefits
Eliminates for

⚡70% more actives

💧16 fl. oz.

🔧Safe for all pipes

Description

🚀 Say goodbye to hair clogs and hello to hassle-free drains!

SEPTIC SAFE - Rest easy knowing it's safe for all septic systems and pipe types.
QUICK ACTION - Just pour, wait 15 minutes, and flush away the hassle!
DIY DRAIN MASTERY - Save time and money by taking drain cleaning into your own hands.
UNLEASH THE POWER - Experience 70% more active ingredients for a first-time drain clear!
VERSATILE SOLUTION - Effectively tackles hair clogs in sinks, showers, and bathtubs.

Liquid-Plumr Pro-Strength Hair Eliminator Gel is a powerful 16 fl. oz. drain cleaner specifically designed to tackle hair clogs, the leading cause of blocked drains. With 70% more active ingredients than standard formulas, it effectively clears slow-running drains in just 15 minutes. Safe for all types of pipes, including PVC and metal, this gel empowers you to manage your plumbing issues without the need for professional help.