Our range of limescale inhibitors all come with a ‘real’ guarantee - others may not
The WHOLE-HOUSE limescale inhibitor with an astounding guarantee...
It works - or your money back...
From just 10p a day!
1/5th of the price of a water softener!
Click here to email us, and we’ll contact you (please include a telephone number
in your email).
What’s the cost?
£99.00 plus p&p of £11.00
What’s the installation cost?
We charge £100 for a typical installation (RG postcode area only) and that includes
a pressure reducing valve. Many plumbers will charge you less than that, and you
can fit it yourself.
What is the LimeStop?
The LimeStop is a limescale inhibitor – it inhibits limescale from forming. Some
people call such devices ‘water conditioners’.
The majority of limescale inhibitors don’t work, do they?
No, they don’t. Many such devices use magnets, electrolytic action, or electronic
waves. If they worked, then the manufacturers would offer you your money back on
performance...but they don’t! Here’s the ‘guarantee’ on a popular-selling ‘limescale
“We guarantee that your ********** will work for you. If you are not satisfied with
after 3 months continuous use please contact us within 30 days of the end of this
Really? Four months? It follows then that after just four months, when you find that
this product (which costs more than £100) doesn’t actually work, then you won’t get
your money back! Here’s another...
“If after six months of continuous use, you are dissatisfied with the
performance of your water descaler, you may return it for a full refund”
Again, after six months you’ll be unlucky when you discover it hasn’t worked! What
good is this? If it really did work, then the manufacturer would surely be happy
to give you your money back no matter when you made your claim?
So why is the LimeStop different?
The LimeStop uses Siliphos - silicate-polyphosphate, so it’s classed as a ‘physical’
limescale inhibitor, in that it actually uses something to inhibit limescale – there
are no smoke and mirrors! Siliphos is remarkable stuff - able to positively halt
Is that why you guarantee it?
Yes, if you research ‘limescale inhibitors’ (on the internet, or even by phone) you’ll
find that manufacturing companies of these devices will NOT give you your money back,
years down the line, if they don’t work! WE WOULD. We can offer such an amazing guarantee
because Siliphos really does work, even in very hard water.
LimeStops have been installed in most parts of the UK, and have been sold in France,
Spain and Belgium.
What are the dimensions of the LimeStop?
Approx 320mm x 110mm (approx 13 inches x 4 inches). The LimeStop projects 140mm away
from the wall it is fixed to.
What does it weigh?
What’s inside that inhibits limescale?
Siliphos - a food grade material called silicate-polyphosphate.
How does it inhibit limescale?
As water flows through the LimeStop it flows over the spheres of Siliphos - and they
give up a slight amount of their coating. Siliphos inhibits limescale in two ways.
First of all it makes the calcium molecules stay in suspension, rather than stick.
Secondly it lays down a layer of silicate-polyphosphate on the walls of pipes etc.
This too helps to inhibit limescale sticking.
How much Siliphos is in there?
900 grams (100 grams more than our closest rival product!).
Why that particular amount?
Because around 900 grams is the optimum amount to ensure limescale inhibition in
the average home.
Does it remove limescale that is already present?
Yes, but it takes time.
Should it be fitted either horizontal or vertical?
Does the Siliphos 'run out' of its effectiveness?
It degrades, that’s why replacement is required in two years. We will send you a
So what will be the continual cost of the LimeStop?
It can be as little as just 10p a day! The cost of replacement (every two years)
is just £76.00 plus postage.
Is it a straightforward swap?
Should I use a plumber to do that?
You could, but it really is very easy - you just need a spanner suitable for the
connections. We explain exactly how to do it below, but it really is a 5-minute job!
Isn’t there a rival product to the LimeStop - where you just replace the Siliphos?
Yes, but the LimeStop still works out cheaper! See the comparison at the bottom of
Is the water drinkable?
Yes, Siliphos is a non-hazardous, food-grade material. It conforms to EN1208:2005
and WHO standards for drinking water supplies. Unlike artificially-softened water,
it's safe for babies too.
Do you supply a ‘check valve’ anyway?
Yes, we do. It’s in the box.
Is it classed as a water softener?
No, the hardness is still there, it's just suspended. This is true of all limescale
inhibitors; if a water conditioner doesn't actually remove the calcium, then it's
not a water softener.
If the treated water is then stored, will it still be effective?
Yes, but the sooner the stored water is used, the better.
I don’t have a 15mm mains water connection
No problem, a 22mm version is available for the same price - just ask for it.
If the treated water is then stored, will it still be effective?
Yes, but the sooner the stored water is used, the better.
Can you supply an even-bigger version to protect a large installation?
Yes, we can, and we’ve reduced the cost! It’s now just £134.00 plus postage of £11.
It contains a whopping 1,200 grams of Silicate-polyphosphate, and if you want one,
ask for the ‘LimeStop Ultimate’. It comes in 15mm, 22mm, or 28mm, requires replacing
every two years at a discounted price of £112.00 - and thus costs from just 15p a
Can I fit a LimeStop Deep Blue to protect a Thermal Store hot water cylinder?
Yes, ask for the 22mm version.
What do I need to install it?
You’ll need some simple fittings, copper tube, a tube cutter, and basic tools - we’ll
help you all the way. Just read the ‘Fitting Instructions’ at the bottom of this
Your instructions say not to fit the LimeStop too close to a heat source, why?
Warm water backfeeding down the supply will degrade the Siliphos. Its period of effectiveness
would be less.
Is it easy to fit?
Yes, very. Fitting should take no more than 30 minutes.
What if there is hardly any pipework to fit it on?
That’s no problem. All you need to do is re-locate the LimeStop away from the piping.
You can route the piping both to and away from the LimeStop with flexible hoses,
so you really need just over 3” of piping.
Can I fit it in a cupboard?
Yes, but not if the ambient temperature is above 30 degrees C for the same reasons
as above. Also, fit it low down in the cupboard where the cold mains enters, as it
would be the coolest part of the cupboard.
Will I still get limescale around my showerhead?
Most possibly, yes. This is because although that the Siliphos-effect will stop your
shower scaling-up, 'still' water (water that doesn’t move) will be left on the showerhead
and around taps etc. The effect will be lost and deposits may well occur. But these
can simply be wiped away, as the deposits aren’t sticky.
What will the LimeStop protect?
The LimeStop is made for ‘mains’ water appliances, such as mains-pressure thermal
store hot water heaters, washing machines, dishwashers, shower mixer units, etc.
What about ‘Megaflow’ type units?
These use a store of hot water, but they are technically ‘heat banks’ and not thermal
stores. We can only state that the sooner the water is used after running through
the LimeStop, the better. The LimeStop is perfect to protect thermal store hot water
What size ports has the LimeStop got?
The LimeStop is supplied with either 15mm or 22mm fittings - you choose.
Will my water pressure be reduced?
The LimeStop is a through-flow unit, and you would not see any noticeable drop in
water pressure or flow after fitting.
Will the LimeStop withstand high water pressures?
Yes, it is a very robust unit, able to withstand 6 bar pressure, with twin ‘O’ rings.
However, it is still essential that you install a pressure reducing valve prior to
the LimeStop - set to 3 bar. We recommend a ‘Reliance’.
What is limescale?
It's dissolved rock. Rain water dissolves the calcium and magnesium out of the rock.
This water is then treated and sent to your home. When the water is heated the dissolved
particles re-solidify and stick to the walls of the heat exchanger. It will do this
at low temperatures, but it really begins at anything above 63 degrees C.
Is limescale harmful?
To your heating appliances, yes, very! Even a tiny coating of it will reduce the
efficiency of your appliance, meaning your energy bills will be higher. It also causes
premature failure of key components. However, to your body, it is beneficial. Remember,
water softeners remove this beneficial calcium, the LimeStop doesn’t.
Why is the LimeStop better than other limescale inhibitors?
The LimeStop requires no electricity or maintenance. It doesn't use questionable
electromagnetic waves. It uses a time-proven material that we feel good enough to
offer our performance guarantee of your money back. And you don’t have to fiddle
with large 'O' rings and wet Siliphos - you simply replace it. You may be aware of
a very similar unit to ours, but it requires 6-monthly topping up, with annual cleaning
and Siliphos replacement.
*Do you guarantee that the LimeStop works?
Yes, we do. Our guarantee is that stated formally below. We believe all limescale
inhibitors should carry a performance guarantee. Don't buy one that hasn't got a
Have you ever had to give anyone their money back due to re-scaling?
How can I get one?
Simply email us or phone us.
Do you give a discount if I buy more than one?
Yes, of course, just email us.
I have soft water, so surely I don’t need a LimeStop?
The LimeStop can even be used in soft water areas, as the Siliphos lays down a protective
coating on the walls of the supply piping - thus preventing acidic-water attack and
so-called ‘Blue Water’.
Why don’t you sell the LimeStop in plumber’s merchants?
Because by the time they have added their mark-up charge, it would make it too expensive.
You get it at the cheapest possible price by buying direct from us. You can have
one posted to you direct simply by emailing us with your preferred contact telephone
number, and we’ll phone YOU to arrange payment. It should arrive within 2 days by
Let us know if you find ANY other manufacturer of a ‘limescale inhibitor’
offering you anything like our amazing guarantee!
Parcel delivery within 2 working days throughout most of UK's mainland. 2-day deliveries
are not guaranteed, but enjoy over 98% success.
Price shown of £11 is for single LimeStops. For larger orders, we would quote you.
The guarantee against ‘scaling-up’ is dependent on the LimeStop being installed for
at least two years. If your combi boiler, thermal store (not heat bank), washing
machine, dishwasher, shower, or pipes should ‘scale-up’ to the detriment of water
flow (we would require proof to satisfy such an occurrence), then we would return
the original purchase price (£99.00) to the original purchaser. Your statutory rights
are not affected.
Cancelling & Returns (your rights)
Cancelling your order before we send it:
Simply contact us by letter or email to cancel - any money already taken will be
returned to your bank account by bank transfer within seven days. Our cancelling
policy is ‘no quibble’.
Cancelling your order after we have sent it:
If you have already been sent the product then we would aim to reimburse you within
seven days of us receiving the product back from you. Please note that under the
Consumer Contracts Regulations you do NOT have the right to return the product and
claim a refund if you have unsealed the box (due to hygiene reasons). However, if
the product is still in its sealed box, you have the right to return it up to 14
days after you receive delivery. You should send the product back via a reliable
courier, and in its original packaging. If you cancel before you receive the product
then obviously there will be no charges made. If, however, you cancel after the product
has been sent to you, then you are liable for the postage costs in returning the
product to us. You should retain proof of posting, but please be aware that it is
incumbent upon you to ensure that we receive it, so we would advise you to require
a signature of delivery. Your cancelling email/letter must include the following
(copy & paste):
I hereby give notice that I wish to cancel my order for the following goods...............
Signature (if letter sent)............................
We want to ensure that you are happy with our service, and that we have been fair
and professional. And we ask that you too are fair in ordering products from us.
Sometimes, packages go astray within the post. We have to claim against the courier
in such circumstances (rare, though they are), and we would not be able to post you
a replacement until we get confirmation from the courier that the item has indeed
been lost. We ask you to be patient, and to work with us to resolve the problem.
We would talk to you by phone to reassure you, and keep you up to date with any information
we have. We would even give you the details of the courier to prove that the item
had indeed been mislaid or lost.
It is imperative that you ensure your mains pressure water serving the LimeStop never
exceeds 6 bar pressure, so we recommend that you install a ‘Pressure Reducing Valve’
prior to the installation - set to 3 bar. We recommend you Google ‘Reliance Predator
pressure reducing valve’ (cost around £28 from JTM Plumbing). However, your water
installation may already have a pressure reducing valve fitted (especially if you
have a thermal store).
We recommend that you purchase your pipe fittings from a store such as ToolStation.
15mm push-fit elbows are just 80p. You should be able to get all you need to fit
your LimeStop easily and quickly. They are open 7 days a week, and even on bank holidays.
On this 15mm installation, the cold mains enters from the left and goes first through
the check valve (provided in the box). So you would need 2 x full-bore isolating
valves (ToolStation code 14624) and four push-fit elbows (Toolstation code 46696).
Your costs would therefore be:
15mm full-bore isolating valve x 2 @ £4.24 each = £8.48
15mm push-fit elbows x 4 @ 80p each = £3.20
1 metre of copper tube = £2.74 (minimum purchase 2 metres)
This is a more-common installation - with the mains cold feed rising, perhaps in
IMPORTANT: Fit your LimeStop so that it serves your house supply ONLY. Do not let
it serve a garden tap, as the Siliphos inside would be wasted (unless your garden
water use is VERY low), in which case it would be ok to let the LimeStop serve the
Decide where your LimeStop is to be sited – given your mains water supply. Always
fit the check valve, and isolating valves, as they make replacement of the unit in
two years much easier. Whether your installed water pipes are horizontal or vertical,
the LimeStop itself MUST be installed vertically. It’s preferable to let it stand
on the base of a cupboard, but it’s essential to use the supplied fixing bracket,
anyway (not shown in the diagrams for clarity). If you would prefer, you can ‘pipe’
your installation using flexible stainless steel tubes, though be sure to use tubes
that are a minimum of 13mm bore (many are not!). If you are unsure of fitting it
yourself, then get a quote from a plumber to install it. Be sure to choose a plumber
that has been recommended to you by a family member or friend. For an easier installation,
consider using push-fit copper fittings.
Turn the incoming water valve (1) off
Open a tap - ensure pressure/flow fades
Now turn the other valve (2) off
Undo the two brass nuts either side of the LimeStop (place a towel underneath)
Unscrew the four retaining screws on the fixing bracket
Fit the new LimeStop to the bracket
Tighten the two brass connections
Turn valve (2) on
Turn valve (1) on
Turn tap off
Check connections for leaks
There is a rival to our product, the CombiMate - that requires you to replace the
Siliphos. However, look at the cost comparison shown below after eight years...
All costs include postage
Costs of CombiMate taken direct from Cistermiser’s website on 08/01/18
The LimeStop contains 100 grams more Siliphos than the CombiMate
The LimeStop requires no fiddling with ‘O’ rings
The LimeStop doesn’t need to be cleaned
The LimeStop is GUARANTEED to work, or your money back
We are Scalgon and we are located at 19 Cockney Hill, Reading. RG30 4HF
We have been dealing with limescale for 42 years now! What we don’t know about it
isn’t worth knowing. We do know that there are LOTS of devices out there, just waiting
for someone gullible to come along. Yes, it’s a great shame, but the vast majority
of limescale inhibitors simply do not work - no matter what they may tell you. Because
we KNOW that ours does work, we offer you your money back should it fail to do so.
And all from just 10p a day! If you still want reassurance, talk to us - we’re very