Mrs Martin’s Probiotic Flush Cistern Block 100g


Who does not like a toilet that smells fresh and clean? This biodegradable, earth-friendly toilet cleaner prevents odours and blocked drains in any toilet. Yes, even an off-the-grid toilet flowing into a septic tank can now smell fresh! The millions of indigenous microbes in this block starts degrading dirt in the water as soon as you flush, keeping your septic tank or local sewage plant working well. Everything else in this block is non-toxic and degrades in less than 28 days so you can rest assured you are doing no harm. Neither to your system nor to the environment.

Directions for use:
Ready to use. Remove from wrapper and place in cistern. Replace as necessary. Depending on how often toilet is flushed, one block can last a month.

Earth friendly bleach that is responsible, intelligent and safe.

Responsible because our ingredients are readily biodegradable to OECD 301 standards and we offer refills to eliminate single use plastic.

Intelligent because our detergents include indigenous, friendly microbes that produce the enzymes necessary to degrade dirt.

Safe because our products are non-toxic and approved by The Allergy Foundation of South Africa.

Our products rehabilitate grey water and are ideal for use in septic tank systems.

Our products are PET FRIENDLY.

Free from

  • Chlorine bleach
  • Triclosan
  • EDTA
  • Phosphates
  • 2-butoxyethanol
  • Phthalates
  • Paraben
  • Ammonia
  • High VOC glycol ethers
  • Formaldehyde


Sodium dodecylbenzene sulphonate, Sodium chloride, Citric acid, Anionic surfactant, perfume, More than 10 million CFU/ml of naturally occurring, indigenous, safe bacteria (Bacillus spp).

Customer Reviews

Based on 14 reviews
Helen Patrick
Very good

The flush cistern block is very convenient to use, and, as with all Mrs Martin's products, I love the fact that it is earth-friendly.

Marina T.
The whole bathroom smells fresh!

The whole bathroom smells fresh!

Mariana B.
Flush cistern block

Keeps toilet fresh and clean

Sabine V.


Anmare R.
Flush 110%

I ordered only one flush to test it out. Wow, what a surprise. I am hooked on the product and have re-ordered. Clean and works super efficiently.

We are so pleased to hear you like FLUSH, Anmare! And thanks for doing your bit to keep our water clean.