Reduces organic waste By up to 97%
Free Septic Booster kit Worth £17.50

We stand by the quality of each of our products and our service too. If for any reason you’re not satisfied with your purchase, you can return any remaining product to us for A FULL REFUND.

Muck Munchers XL + FREE Bio-Booster

Muck Munchers XL Septic Tank Treatment

Best Septic Tank Treatment UK

SAVE £100’s on septic tank pump-outs

12 x TREATMENTS – Just £3 a Month

4.9 / 5
Based on 1034 Product Reviews

Top-Selling Septic Tank Bacteria Treatment

Price £37.95

A flushable septic tank treatment bacteria treatment for domestic septic tank owners who want an easy solution to maintain healthy, efficient, and odour-free septic systems, clog-free drains and soakaways whilst doing their bit for the environment. 

Muck Munchers XL is a flushable septic tank treatment programme. You will receive a year’s supply of septic tank bacterial sachets. Flushing one sachet per month down your toilet reduces organic waste by up to 97%, saving you £100’s on unnecessary septic tank pump-outs.

Benefits of Muck Munchers Organic Septic Tank Treatment

  • 12 Monthly Septic Tank Treatment - Less than £3 per Month
  • Digests Organic Waste - Reducing Expensive Pump-Outs, Saving £100's
  • Maintains Entire Septic Systems - Ensuring Clog-Free Drains & Soakaways
  • Eliminates Grease Build-Ups – In Your Tank & Drains
  • Suitable for All Tank Types - Including Bio Treatment Plants
  • No Unpleasant Smells & Unsightly Over-Flows – Fewer Health Hazards
SKU: MM12BB1 Category:


Muck Munchers Xl 12-Month SEPTIC TANK TREATMENT Reduces Organic Waste by up to 97%

To guarantee success, each 12-month Muck Munchers XL programme comes with a Free Septic Tank Booster Pack.

The flushable septic tank treatment and septic booster work together to maintain your system in tip-top condition, digesting organic material, including fats and grease, counteracting detergent, bleach and other chemical contaminants. Plus – Muck Munchers are perfect for modern sewage treatment plants as well as traditional septic tanks.


By design, your septic tank naturally breaks down wastewater, cleaning chemicals and other pollutants. Find out how your septic system works.

When this natural digestion process is disrupted the natural enzyme-producing bacteria in your tank are weakened and occasionally destroyed resulting in a build-up of fats, oils, greases, excessive sludge, foul smells and blockages.

The monthly addition of Muck Munchers® septic tank treatment will maintain the ecosystem in your septic tank to promote the growth of the natural microorganisms (good bacteria) resulting in a reduction and the slowing down of build-ups, resulting in fewer pump-outs, odourless septic tanks and a reduced chance of soakaway problems.

How Many Septic Tank Treatment Sachets Do I Need?

Only one Muck Munchers monthly septic tank bacterial treatment sachet is required for households of up to 6 people.

For large households, if you have significant amounts of washing-up, laundry, baths and showers, you may need to double the dosage.

How to Use Muck Munchers XL Septic Tank Treatment for Shared Tanks

If you share a septic tank with a neighbour, we recommend that you use separate packs for each property if the total count exceeds six people or use our Mega Munchers Septic Tank Treatment.

Septic Tank Treatment for Blockage Free Drains

There’s great merit in applying Muck Munchers XL Septic Tank Treatment to a different toilet each month.

When you flush the septic tank treatment sachet down the toilet, a proportion of the microbes will attach to organic waste on the drain surfaces, increasing digestion and reducing the chances of blockages.

The best toilet to apply Muck Munchers initially is the one furthest away from the outlet drain to the septic tank.

A weekly application of Digesta® Drain Cleaner maintains free-flowing kitchen sinks, bathroom basins, showers and baths avoiding unnecessary blockages and black slime build-up.

Triple Action Bog Busters Tank and Soakaway Reactivator

If you have not had your septic tank emptied for some considerable time or you are experiencing slow drainage from the tank to the drainfield, it is advisable to first treat your septic tank with Triple Action Bog Busters.

This is an intensive septic tank treatment to reinvigorate stagnant septic tanks and very slow draining soakaways, using a powerful microbial septic tank treatment, together with an industrial bacterial grease digester and an oxygenator, which increases microbial activity 7 – 10 fold.  See more at Triple Action Bog Busters.

If you are also experiencing wet, boggy soil areas around your tank, do take a look at the next section, ‘Treating Boggy Soakaway Conditions’.

Treating Boggy Soil Soakaway Conditions

Soakaways can often become boggy in extremely wet winter conditions or where there is a very high water-table (the depth at which underground soil is saturated with water). This will undoubtedly have been a long-term problem that can only be overcome by improving drainage in the area.

Most frequently, the problem is that not only have the outflow drains become far less effective, but also, the surrounding soil particles will have become coated with contaminants blocking the ability for free-drainage to the surrounding area.

The Recommended Septic System Treatment is –

You will need to purchase Oxy-Tonic to use with some of your Muck Munchers XL septic tank bacteria treatment sachets.

1. Treat Your Secondary Tank

Dilute 200 – 250mls of Oxy-Tonic in 10 litres of water and pour into the secondary tank.

Next, dissolve 2 sachets of Muck Munchers XL septic tank treatment in 5 – 10 litres of water and again pour into the secondary tank.

NOTE – if you are planning on using Triple Action Bog Busters you can omit this treatment and go straight to treating the soil area as described below.

2. Treating the Soil Area

Dilute 100 ml Oxy-Tonic in a 10 litre watering can and water over the boggy area.

Next, dissolve a Muck Munchers XL soluble sachet in the 10 litre watering can and water over the same area.

Repeat the soil treatment process again in the next day or two, and then with a single treatment weekly for the next 3 weeks.

How to Use

Muck Munchers XL + FREE Bio-Booster

SEPTIC TANK TREATMENT: Just Flush & Forget! 

1. Simply flush the soluble septic booster down a toilet. It’s then best not to use the toilet for a few hours, to help ensure some microbes also populate drain walls to clean them up too.

2. Then each month flush down a Muck Munchers soluble septic tank bacteria treatment sachet to maintain a healthy microbe population. To help you remember, we will send you a reminder on the 1st of each month.

TIP – If you have a slow-draining sink, dissolve a Muck Munchers XL sachet in luke-warm water last thing at night. Then let it flow into the trap and drain. Leave any residue until morning before flushing it away. It will digest fats, oils and greases coating waste pipes.

4.9 / 5
Based on 1034 Product Reviews
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