What is the question really asking?
In Cheshire, a search for a drain unblocker usually means a sink, a bath or a shower has stopped emptying. Readers in Crewe, Nantwich and Sandbach are the first audience. A plunger, opening a trap, a cable, a poured product and a machine are different responses. This page does not name a product, and it does not rank one.
It will not tell you how to mix, heat or dose a product. If a label is unclear, stop and ask a plumber, and tell them what has already gone down the pipe.
Anyone in the UK can still post a job or register a business. How fast you get quotes depends on how many local businesses have joined near you [QZ5].
What are the usual options?
This list is not a ranking.
- A plunger on a single basin. You may already have tried this. It does not clear a blockage further down a shared stack.
- Opening the trap. That is a small plumbing job under the basin. This page does not tell you to undo the trap.
- A cable. A plumbing snake is a mechanical tool, not a liquid. Plumbing snakes are a different question. Do not run a cable through a pipe you have just filled with a poured product.
- A poured product. Some are sold for kitchens and some for bathrooms. This page does not say which is suitable. The label does, if the product is allowed for that use.
- A machine further down the drain. If several fittings fail together, the blockage may be outside the trap.
What does HSE say about biocides?
Not every drain product is a biocide, and this page will not sort them for you. Where a product is a biocide, HSE says everyone who uses biocides is responsible for using them correctly [S1]. Before you buy or use one, HSE says to consider whether there is a problem that needs controlling, and whether a non-chemical method would do instead [S1]. If you are not a professional, HSE says to consider using a professional pest controller to deal with the problem, and it cannot recommend any specific companies [S1]. HSE also cannot recommend any specific products [S1]. That pest-controller sentence is about a biocide problem. A slow basin is usually a plumber's visit. Pest control is the page for insects and rodents, not for a sink that will not empty.
HSE says members of the public should never use biocidal products that are only intended for professional users, because those users are required to have had the appropriate information, instruction and training [S1]. You do not need specific training to use a product intended for the public. Following the label instructions carefully should be enough [S1]. Before you use a biocidal product, you must read and understand the label, follow those instructions, and not use the product for any purpose other than the one it is authorised or approved for [S1].
When you store a biocide, HSE says to keep it in its original container, tightly closed, and out of reach of children and pets [S1]. This page does not tell you how to dispose of leftover liquid. Check the label. If you are not sure, contact the waste disposal department of your local authority [S1]. If you feel ill after using a biocide, HSE says you should first seek medical advice [S1].
When is a plumber the safer call?
Stop pouring things in if:
- more than one fitting is affected
- the pan water level rises
- you have already used one product and the pipe is unchanged
- the outside gully is full
WaterSafe Register describes itself as an online directory of plumbers and other water specialists, and says approved contractors issue certificates of compliance [S2]. That certificate is about the water work, not about a bottle. Search the directory yourself if you want someone listed on it. We don't check insurance, qualifications or registrations, so please check these yourself before you hire.
What should a written quote cover?
Citizens Advice says a quote is a fixed price and an estimate is a rough guess, so do not rely on a verbal quote: get it in writing [S3]. After you say yes to a quote, it is a binding agreement between you and the trader, whether or not it is written down, but having it in writing means you can check what you agreed [S3]. Try to get written quotes from at least 3 traders [S3]. Some traders charge for quotes, so ask about this first [S3].
If an advert says there is no call-out charge, the CAP advice on the Advertising Standards Authority website says the claim should be made only when there is no charge for the time spent travelling, the initial diagnosis, or any other charge before the work is agreed [S4]. The same advice says that unless a customer can decline the work without incurring a cost, that advert should not charge for the travel time and the initial diagnosis [S4].
Ask the written price to say whether they will use a chemical, a cable, or both, and what happens if the first attempt fails. Citizens Advice says a quote should say whether the price includes VAT [S3]. A business must register for VAT if its total taxable turnover for the last 12 months goes over £90,000, or if it expects that turnover to go over £90,000 in the next 30 days [S5].
If a deposit is for materials, Citizens Advice says to offer to buy the materials yourself instead of paying a deposit [S3]. Where a deposit cannot be avoided, it says not to agree to more than 25%, and to get a receipt [S3].
Jobs you might post
These are examples, not taken from real job posts.
- The kitchen sink has been slow for a week. You have not poured a product in. Ask for a written price that says whether the trap is opened.
- A bath and a basin are both blocked. You used one poured product yesterday and it did not help. Name the product. Ask the plumber not to add another until they have seen it.
- The downstairs WC is slow and you can smell drains in the hall. Stop using it. Ask for a plumber, not a bottle.
How do you compare the replies?
Citizens Advice says to be cautious if a price is a lot lower than the other quotes. It might mean the trader does not have the right skills or experience, or is not being honest, and it could also mean they are not quoting for exactly the same work [S3]. Be wary if a trader will not put the quote in writing [S3]. Ask to see their insurance policies, and check they do not run out before the work will be finished [S3].
Plumbers are the trade page. The plumber cost guide is about how to read a written price.
This page is general information, not professional or legal advice. QuoteZila does not check Gas Safe, WaterSafe, NFRC, NICEIC or other registrations against the register on your behalf: look them up yourself.
Honest status: QuoteZila is new. We're starting in Cheshire, beginning with Crewe, Nantwich and Sandbach, and growing area by area. Anyone in the UK can still post a job or register a business. How fast you get quotes depends on how many local businesses have joined near you. Businesses can register and receive jobs straight away. We don't check insurance, qualifications or registrations, so please check these yourself before you hire.
Posting a job is not open yet
What do people ask about drain unblockers?
Should I pour something down a blocked sink?
This page does not tell you to. If you are not a professional and the product is a biocide, HSE says to consider a professional pest controller, and it cannot recommend any specific companies. A blocked sink is often a plumber's job rather than a pest job. If you already have a product, read and understand the label before you use it.
What if the product is a biocide?
HSE says everyone who uses biocides is responsible for using them correctly, and that you must read and understand the label before use. Members of the public should never use biocidal products that are only intended for professional users, because those users are required to have had the appropriate information, instruction and training. This page does not say whether a particular drain product is a biocide. Check the label, or ask the plumber not to use one.
When should I call a plumber instead?
Call a plumber if more than one fitting is slow, if the pan water rises, if you can smell sewage, or if a product has already been poured in and nothing has changed. WaterSafe Register describes itself as an online directory of plumbers and other water specialists, and says approved contractors issue certificates of compliance. Search that directory yourself if you want someone listed on it.
Does QuoteZila check plumbers?
No. We don't check insurance, qualifications or registrations, so please check these yourself before you hire. You can report a quote or a business from your job page.
Can I post a blocked drain on QuoteZila?
Yes. Name the fitting, say whether you have poured anything in, and add a Cheshire postcode. Up to five matched local businesses can quote. QuoteZila is free for customers and local businesses. How fast you get quotes depends on how many local businesses have joined near you.
Part of Trades. All services
Related trades
Cost guides
Related pages
- Header Tank: What to Ask Before a Visit. A header tank is the cold-water cistern in a loft. This Cheshire page says what to ask a plumber, and why you should not climb up to look.
- How to remove a toilet flush valve. How to take out a push-button toilet flush valve to change a worn seal, which valves twist out, which need the cistern off, and when to call a plumber.
Sources
- QZ1: QuoteZila product fact. QuoteZila home and FAQ copy.
- QZ2: QuoteZila product fact. QuoteZila terms, customers.
- QZ5: QuoteZila product fact. QuoteZila coverage wording.
- S1: Using biocides: overview, HSE. Accessed 2026-10-28. https://www.hse.gov.uk/Biocides/using/overview.htm
- S2: WaterSafe Register, WaterSafe. Accessed 2026-10-28. https://www.watersafe.org.uk/
- S3: Before you get building work done, Citizens Advice. Accessed 2026-10-28. https://www.citizensadvice.org.uk/consumer/getting-home-improvements-done/before-you-get-building-work-done/
- S4: Call-out charges, CAP advice on asa.org.uk. Accessed 2026-10-28. https://www.asa.org.uk/advice-online/call-out-charges.html
- S5: Register for VAT, GOV.UK. Accessed 2026-10-28. https://www.gov.uk/register-for-vat