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    Septic tanks: What not to do

    1st June 2022

    More than half a million homes in the UK have a septic tank, and most homes with private drainage have a septic tank into which wastewater from loos, showers, sinks, and washing machines is discharged. Making sure you know what not to do with a septic tank is important to avoid unnecessary damage and expenses.

    Check out our list of what not to use with a septic tank, this is not a complete list as there are many other things but a basic list of everyday items. So, here are a few things you should not put in your septic tank:

    • Bleach
    • Paint
    • Disinfectants
    • Garden pesticides
    • Medicines
    • Solvents like white spirit
    • Drain cleaning and unblocking liquids that contain caustic soda
    • Cigarette butts
    • Disposable diapers
    • Sanitary pads & tampons
    • Wipes
    • Pop-off toilet brush scrubbers
    • Rubbish
    • Condoms
    • Hair
    • Plasters
    • String
    • Coffee grounds
    • Paper towels
    • anti-bacterial soaps – biodegradable soaps only!
    • latex, plastic, or metallic objects
    • hard toilet paper – soft is better for the tank
    • Dead fish
    • Kitchen grease

    There are cleaning products that have been specially designed for use with septic tanks, so keep an eye out for these as they are better for your tank. If you are unsure of any issues with your septic tank, please don’t hesitate to contact us on 01386 882324.

    Some of our services include:


    Get in touch

    Contact our friendly and professional team via form, phone or email for any drainage issues you may have.

    From blocked drains to septic tank repairs and replacements, we're here to help. We have over 25 years of experience and offer 24/7 emergency callouts.


    Cotswold Drainage Ltd were very organised, punctual and efficent with both the septic tank emptying and also the CCTV survey. I cannot fault them and both the guys who we dealt with on the day were such great advertisements for the company. A pleasure to deal with all round.
    - Rob Merson
    Excellent service, the operator was knowledgeable and had a couple of ideas about our tank. Very happy to recommend them.
    - Adrian Cox
    - Sue Court
    Throughly recommend Cotswold Drainage. We’ve used them for a number of things (cctv survey, service and tank cleaning) and always had an excellent service. Everyone attending is friendly and explains what they are doing, why and, if necessary, whether extra work is involved and any additional costs. Will be using for annual service and clean of treatment plant going forward over other providers.
    - Kay Louise Percival
    Very good company to deal with, helpful, efficient and good at what they do, Highly recommend Stu and the team
    - Barry Williams
    Very impressed from start to finish. A well established & efficient company with polite & well trained staff. It's what you always hope for but rarely get these days. Very pleased so far with what's been & I won't hesitate to contact you in the future for more drainage treatment.
    - Paul Maund
    Can’t recommend Cotswold Drainage enough. They were super responsive and came out to us on a bank holiday weekend to fix a blockage. Adrian is a huge credit to their company - he was so knowledgable, friendly and professional. You’ll be our first port of call in the future!
    - Jennifer Reay
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