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Product Details

Environmentally friendly solution for drain maintenance.



Contains natural bacteria (1.6 billion per ml), yielding speedy breakdown of fats, proteins and carbohydrates.

Technical Specification
Brand Barrettine
Manufacture ID KOBD001
Safety Data Sheet click here
Delivery details

Covid-19 Update

  • Free Next Business Day delivery for orders over £25 to home and site is available for orders placed before 5pm
  • Saturday and Sunday delivery is now available for orders placed before 4pm on Friday for Saturday delivery and 4pm Saturday for Sunday delivery, see here for details
  • We have temporarily suspended our Pre-12 delivery service
  • Once your order has been dispatched you will receive an invoice email with the courier details and your tracking number
  • Alternatively go to MyAccount, click on your Order History, click on the TRACK icon to link through to the carrier website and the tracking details for your delivery
  • If your order contains more than one item it may be split into two deliveries as we manage volume across our network
  • Due to carrier constraints it is not currently possible to deliver age restricted items. Please use our Click & Collect service for these products
  • Delivery direct from suppliers is now available and specific delivery times will be displayed on the product page
Order Value: Under £25 Over £25 but less than £75 £75 & Over
Next Business Day Delivery (Mon-Fri) usually before 6pm £5 Free Free
Pre-12 Delivery before 12 noon Next Business Day £10 £5 £5
Remote areas standard delivery (2-4 days) £5 Free Free
Saturday Delivery order by 4pm Friday £10 £5 Free
Sunday Delivery order by 4pm Saturday £10 £5 Free


Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details

Covid 19 Update

Click & Collect

  • Safe contactless collection is available 7 days a week at our branches
  • Our branches are open 7am-5pm Mon-Sat and 9am-4pm Sun
  • Keeping our colleagues and customers safe and well and respecting stringent social distancing requirements is our number one priority – 2 metre rule enforced
  • Our available product range will not require more than 1 person to lift
  • Please see our guide to click and collect below

  • Please ensure that your mobile number is added so that we can text you when your order is ready to collect

Call & Collect

Due to current trading conditions we have suspended our Call & Collect service until further notice.

If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 7pm Mon-Fri (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Reviews
Knock-out Biological Drain Treatment 1L is rated 4.0 out of 5 by 23.
Rated 1 out of 5 by from DON’T BUY THIS!!!! Absolute rubbish and a waste of money. Didn’t work at all not one bit and had to go to a plumbers merchant to get the correct product, Toolstation shouldn’t be selling this at all
Date published: 2020-04-29
Rated 5 out of 5 by from Very efficient This non-toxic product proved to be a very effective unblocked of drains
Date published: 2020-04-29
Rated 5 out of 5 by from Great stuff Brought this a few weeks ago and worked great on our slow flowing shower , not to bad a smell compared to others
Date published: 2020-04-29
Rated 4 out of 5 by from Works well Does what it says, bit of smell using it but soon goes
Date published: 2020-04-02
Rated 5 out of 5 by from The only thing that worked! Tried just about every product to clear a blocked shower. This is the only thing that worked. Left overnight then used plunger.
Date published: 2020-02-21
Rated 5 out of 5 by from Usual great service Bought this item for park home where we have bacterial toilet system
Date published: 2019-05-09
Rated 5 out of 5 by from Works well Always use this product to keep the waste pipe clear of build up of grease. Biologically friendly and easy to use.
Date published: 2019-04-04
Rated 1 out of 5 by from Poor product This did not help the partial blockage from my shower tray. I'm going back to using a conventional product
Date published: 2019-02-19
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