Limescale protection without power or chemicals 30-day free trial
Order POSEIDUM with free shipping anywhere in Europe, test it for 30 days at home –
only after the trial period do you automatically receive an invoice. Not convinced?
On request, we send you a free return shipping label.
What POSEIDUM does and how the 30-day trial works – straight from us. (Video in German.)
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The problem
What hard water does to your home
Millions of households in Europe deal with the consequences of calcium-rich water every day –
on fittings, in pipes and on surfaces.
Scaled-up fittings & pipes
Limescale narrows pipes, reduces water pressure and stiffens taps.
In the worst case, the pipework has to be replaced.
Shorter appliance lifespan
Washing machine, coffee machine, dishwasher – limescale attacks heating elements and increases
energy consumption by up to 15%. Expensive early repairs are the result.
Endless cleaning
Limescale rings on tiles, spots on glasses, stains in the shower – if you have
hard water, you clean more, you buy more detergent and you never quite catch up.
Why POSEIDUM
Limescale protection without power, without chemicals – and without compromise
25+ years of experience in physical water treatment meet state-of-the-art magnetic technology.
The result: the simplest limescale protection for rented apartments.
No power & no chemicals
Purely physical action through permanent magnets. No cables, no salt, no filters – and zero running costs, forever.
Self-install in 15 minutes
POSEIDUM simply clips onto the water pipe. No tools, no plumber, no intrusion into your installation.
Portable – take it when you move
Perfect for rented apartments: POSEIDUM is not permanently installed. When you move, simply remove it and reattach at your new home.
10-year warranty
Waterproof, frost-resistant, shock-resistant – we stand by the quality of POSEIDUM for a full decade.
30-day free trial
Order POSEIDUM with no prepayment. You test it for 30 days in real life – only afterwards do you automatically receive an invoice. Not convinced? Free return shipping on request, EU-wide.
All minerals preserved
POSEIDUM does not soften the water – calcium and magnesium stay in the water, only the crystal structure changes.
How the trial works
Four steps to limescale-free water – with no risk
You order, test, and decide only after 30 days. No prepayment,
free EU-wide shipping – with free return shipping on request.
1
Order
You receive your POSEIDUM device with free shipping anywhere in Europe – no prepayment.
2
30-day trial
Install POSEIDUM yourself (15 minutes, no tools) and test it in your everyday life.
3
Keep or return
Happy? You automatically receive an invoice. Not convinced? On request we send
you a free return shipping label.
4
10-year warranty
For everyone who keeps POSEIDUM: a full 10-year functional warranty on the device.
How POSEIDUM stops limescale – physically & permanently
Not by removing limescale, but by intelligently restructuring it: the magnets convert hard calcite crystals
into harmless aragonite – limescale build-up is reduced for the long term.
1
Build a magnetic field
POSEIDUM creates a strong, permanent magnetic field directly around your water pipe – entirely without electricity.
2
Calcite to aragonite
As water flows through, hard, angular calcite crystals are converted by the magnetic field into round,
harmless aragonite crystals.
3
No more sticking
The round aragonite crystals no longer adhere to taps, tiles or appliances –
they are simply rinsed away with the water.
Calcite → Aragonite: the conversion in detail
Watch how the sharp, sticky limescale crystals (calcite) are rounded off by POSEIDUM's magnetic fields
and converted into harmless aragonite.
Calcite (raw, sticky)
Converting
Aragonite (round, harmless)
Calcite – untreatedHard & angular
Sharp, jagged crystals that latch onto pipes and surfaces. Hard water forms this shape.
Magnetic force
Aragonite – treatedRound & harmless
Rounded crystals that no longer adhere. They remain dissolved in the water and are simply rinsed away.
Visible effect
Less limescale on taps, showers & appliances
After just a few weeks with POSEIDUM the difference is obvious: fittings stay cleaner for longer,
shower nozzles no longer get blocked.
Taps without limescale rings – noticeably less cleaning
There are many limescale solutions out there – but none is as simple, affordable
and sustainable as the physical magnetic approach.
Criterion
POSEIDUM lime magnet
Salt-based softener
Limescale filter
Purchase cost
From 369 EUR
800–2,500 EUR
150–600 EUR
Running costs
None
Salt + power >100 EUR/yr
Filter changes >50 EUR/yr
Installation
DIY in 15 min
Plumber required
Partly DIY
Maintenance
Minimal (2×/yr)
Regular
Regular
Suitable for rentals
Yes – portable
No
Partly
Chemicals / salt
None
Salt consumption
Depends
Minerals in water
Fully preserved
Partly removed
Partly
Risk-free trial
30 days free, EU-wide
Rarely possible
Often 14-day right of withdrawal
Functional warranty
10 years
2–5 years
2 years
Customer reviews
What our customers say
127 verified reviews, averaging 4.8 out of 5 stars.
“I've been using POSEIDUM for nearly three months in my apartment in Graz and I'm very happy with it.
Installation was done in 15 minutes. Since then I've noticed clearly fewer deposits on shower taps and tiles.
What I particularly like is that the system is maintenance-free.
The price is absolutely fair for the quality and the savings on cleaning products.”
CH
Claudia H.
Graz, Austria
“As a fan of sustainable solutions I was looking for something without chemicals or electricity.
POSEIDUM is ideal for that. Cleaning effort has dropped noticeably, the fittings stay shiny for longer.
What particularly convinces me is the robust build. The price is absolutely reasonable – especially
because there are no running costs.”
TB
Thomas B.
Dornbirn, Austria
“I live in Munich and used to have major problems with limescale, particularly on the coffee machine and glasses.
After four months with POSEIDUM the situation is much better. Slight traces still appear occasionally,
but it's maintenance-free and easy to install – I find that especially practical.”
EM
Elisabeth M.
Munich, Germany
“In my new-build apartment in Linz the water was quite hard. With POSEIDUM the limescale issues have
clearly diminished. No chemicals, no electricity – that also fits my sustainable lifestyle.
For this price, a clear recommendation.”
MR
Markus R.
Linz, Austria
“As a tenant I was sceptical whether I'd be allowed to touch the water pipes at all.
With POSEIDUM that's no problem – nothing is opened, nothing is screwed in. Since installation the limescale
in my shower has noticeably reduced. Great idea, brilliantly done!”
SK
Sabine K.
Salzburg, Austria
4.8
from 127 verified reviews
Frequently asked questions
Everything about the POSEIDUM lime magnet
Didn't find what you're looking for? Email us:
POSEIDUM is a magnetic limescale protection device for apartments and rented homes. It creates a strong
permanent magnetic field around your water pipe. As water flows through, the hard calcite crystals
(which are responsible for limescale build-up) are converted into round aragonite crystals –
these no longer adhere to surfaces and are simply rinsed away with the water.
The mineral content of the water is fully preserved.
Yes, completely. POSEIDUM operates purely physically – through the power of permanent magnets.
It needs no power connection, no salt, no chemicals. No running costs,
no service contracts. Buy once, enjoy limescale-free surfaces for years.
Salt-based softeners exchange calcium for sodium and need a constant supply of salt and power.
POSEIDUM only changes the crystal structure – all minerals (calcium, magnesium) remain
fully in the water. No running costs, no installation by a professional and also suitable for
rented apartments, since no intervention in the pipework is required.
Yes, in under 15 minutes and completely without tools. POSEIDUM is simply clipped onto the water
pipe – no pipe cutting, no screwing, no drilling. No professional needed either.
A detailed illustrated installation guide is included.
Yes – this is one of the biggest advantages over permanently installed systems.
POSEIDUM is not fixed to the pipes. When you move, simply remove it, pack it up and reattach it at your new home.
Ideal for tenants and anyone who relocates often.
Nothing. 30 days completely free, shipping included. No prepayment required –
you only receive an invoice after the trial period (if you choose to keep POSEIDUM).
If you choose to keep the device, you'll automatically receive an invoice.
Otherwise you return POSEIDUM free of charge – on request we issue you a free
return shipping label.
During the 30-day trial period you can return POSEIDUM at any time
free of charge – on request we issue you a free return shipping label, and you incur
no costs whatsoever. For everyone who keeps POSEIDUM, the 10-year functional warranty
on the device then applies.
10-year functional warranty on the device. Waterproof, frost-resistant,
shock-resistant – in the event of a defect due to material or functional fault, POSEIDUM
is repaired or replaced free of charge.
Yes. POSEIDUM is designed specifically for medium to very hard water – as found in
large parts of Austria, southern Germany and Switzerland. The permanent magnets
work independently of hardness levels: the more limescale in the water, the more clearly
the effect shows.
No running costs – no electricity, no salt, no filters, no service technician.
We only recommend removing POSEIDUM twice a year for 24 hours, so that accumulated
magnetic particles (mainly iron) can detach. Then simply reattach – that's it.
Yes, we ship POSEIDUM free of charge to all EU countries. Shipping
originates in Austria, delivery takes 3–5 working days within the DACH region
and 5–8 working days in the rest of the EU. You receive a tracking number
by email after dispatch.
Yes – in fact, POSEIDUM was designed precisely for this use case. There is no intervention
in the pipes, no drilling, no remodelling. POSEIDUM is simply clipped on – you don't need
to ask the landlord. And when you move out, you simply take it with you.
Put an end to limescale in your home
POSEIDUM – magnetic limescale protection without power, without chemicals, without running costs. 30-day free trial, free EU-wide shipping, 10-year functional warranty. Made in Austria.
30-day free trial
Free EU-wide
10-year warranty
Made in Austria
Order
30-day free trial – no prepayment
Enter your details – we get back to you within 24 hours.
You receive POSEIDUM with free EU-wide shipping and test it for 30 days. The invoice follows automatically only after the trial – otherwise return is free on request.
4.8/5 from 127 verified reviews · 30-day free trial · free shipping across the EU
Do you live in a detached or terraced house?
For larger properties with higher water throughput, we recommend our
sister brand Aquavital – with a 50-year warranty and stronger magnets.
