Stops this...


For just...


a day








Protects your home against limescale...

Boiler, Hot water cylinder, Dishwasher, Washing Machine, Shower...*


and all for just 10p a day!**


The ONLY limescale inhibitor with a REAL money-back guarantee!




Yes, really!


You can read a lot about so-called ‘limescale inhibitors’, how they will remarkably halt limescale - even though there’s actually nothing to them! Or maybe they use a magnet, or electronic waves. But only ONE comes with a ‘forever’ money-back guarantee...and that’s ours. And that really says it all. If you’re thinking of choosing something else, just ask them if you can have your money back in 15 years’ time.


No electricity

No salt

No moving parts

No back-flushing

No smoke...no mirrors!


Not only is the LimeStop adequate to

protect all the appliances in your home...



The treated water is even safe for babies...

unlike artificially-softened water!

It conforms to EN1208:2005 and WHO standards for drinking water supplies



Deep Blue - 15mm - £89.00 (inc. p&p) Credit and Debit Card Acceptance for small business with paya_card_processing_services


Deep Blue - 22mm - £89.00 (inc. p&p) Credit and Debit Card Acceptance for small business with paya_card_processing_services



The LimeStop Deep Blue should be installed on a water supply of less than 6 bar pressure. The Deep Blue is pressure-tested to 6 bar, but it is not recommended that this level of pressure is sustained. If you suspect this then you or your installer MUST install a pressure reducing valve (you may already have one). They typically retail for £20. The LimeStop Deep Blue should be fitted vertically on your mains water pipe preferably after the draw-off for your garden tap.





The LimeStop Deep Blue is almost £60 cheaper than its nearest rival...

AND you don’t have to replace the Siliphos annually, or top it up...

AND you can fit it to 22mm water supplies!



The LimeStop Deep Blue – our most frequently-asked questions:


What is the cost?

£89.00 including p&p.

What is the LimeStop?

The LimeStop Deep Blue 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 inhibitor’...

We guarantee that your ********** will work for you. If you are not satisfied with the performance after 3 months continuous use, please contact us within

30 days of the end of this period


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 limescale formation.

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.

Like where?

LimeStops have been installed in most parts of the UK, and are sold in Ireland, France, Spain, Belgium, and Barbados.

What are the dimensions of the LimeStop?

Approx 320mm x 110mm (approx 13 inches x 4 inches). The LimeStop Deep Blue projects 140mm away from the wall it is fixed to.

What does it weigh?

2 kg.

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 Siliphos particles - which give up a slight amount of their coating. Siliphos inhibits limescale in two ways. First of all the polyphosphate makes the calcium molecules stay in suspension, rather than stick. Secondly the silicate lays a layer on the walls of pipes etc. This too helps to inhibit limescale sticking.

How much Siliphos is in there?

Approximately 800 grams.

Why that particular amount?

Because around 800 grams is the optimum amount to ensure limescale inhibition in the average home. We can supply a ‘larger’ version (with 1.2kg of Siliphos) for larger homes. Please contact us as it’s a special order.

Does it remove limescale that is already present?

Yes, but it takes time.

Should it be fitted either horizontal or vertical?

Always vertical.

Does the Siliphos 'run out' of its effectiveness?

It degrades, that’s why a replacement cartridge is required in two years. We will send you a reminder.

So what will be the continual cost of the LimeStop?

**It can be as little as just 10p a day because the replacement is just £76 (plus p&p of £4).

Is it a straightforward swap?

Yes, very.

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 can explain exactly how to do it, but it really is a 5-minute job! You simply replace the whole unit (for ease) at a cost of £76 (plus p&p of £4) with a ‘Deep Blue C’ - the ‘C’ is for cartridge-replacement.

Isn’t there a rival product to the LimeStop - one where you just replace the Siliphos?

Yes, but the LimeStop Deep Blue still works out cheaper!

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.

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.

If the treated water is then stored, will it still be effective?

Yes, but the sooner the stored water is used, the better.

What do I need to install it?

You may need some simple fittings, copper tube, a tube cutter, and basic tools.

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 3” of piping. You should also fit a check valve.

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 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 cylinders.

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 - if you suspect that your pressure is very high (over 4.5 bar).

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 money-back guarantee.

Have you ever had to give anyone their money back due to re-scaling?

No, never.

Do you give a discount if I buy more than one?

Due to our profit being quite low on the Deep Blue, we can only offer a discount if you buy three or more. Please email us.

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. It should arrive within 2 days by courier.

Can you install the LimeStop for me?

We can do this, but only in the RG postcode area, sorry! But any plumber can do it, and it’s not at all difficult for the average diyer. You may only need a hacksaw and a spanner!

How quickly can I get one?

We send our LimeStops by Royal Mail - signed-for 2nd class post. If you really need it next day then please contact us to arrange payment by bank transfer instead of clicking on the buy buttons. We’ll arrange a courier. Next day delivery has to be paid for prior to midday as that’s the deadline for the courier to deliver within 24 hours.

Can I come and buy a LimeStop at your door?

Yes, if you’re close to us (we’re in Reading, Berkshire) but call ahead first on 07702316157.


Why we will NOT offer PayPal.

PayPal is a very ineffective and poor payment facilitator. It does NOT protect you in many circumstances, and its ‘Resolution Service’ even circumvents British consumer law! It isn’t good for us, because PayPal’s charges would make our products more expensive, and it isn’t good for you because it takes too long to settle any disputes. We advise that you are much safer using your credit card, as that protects you under Section 75 of the Consumer Credit Act. What is actually needed is a government-controlled escrow scheme. Don’t hold your breath waiting for that!


Finally - what the LimeStop is, and what it isn’t:

The LimeStop will stop limescale forming on the inside of pipes, etc. It is not a water softener. The ‘hardness molecules’ are still there, but the LimeStop WILL stop limescale by these molecules staying together and coming out in the water - not sticking. That’s how it works.




*The guarantee:

The guarantee against ‘scaling-up’ is dependent on the LimeStop being installed for 30 months and at least one replacement. If the protected appliance/s* 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 of the LimeStop Deep Blue (£89) to the original purchaser. Your statutory rights are not affected.

*Protected appliance/s: The unit purchased must be stated as suitable for its application.



Office address (only): 19 Cockney Hill, Reading. RG30 4HF.  Tel. 0770 231 6157 (mobile rates apply)


Last update July 2, 2020


Truly remarkable limescale inhibitors

Stop limescale...or your money back...GUARANTEED

...from 1/6th the price of a water softener!



Choose the best limescale inhibitor for you...

from just £29!


The ONLY limescale inhibitors with...



The vast majority of the limescale inhibitors we sell are made in Britain.

We also sell one product which is made in Poland.


NONE of our products are made in China!

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Best for whole-house protection (up to 3 beds & 2-3 people)

Great for protecting thermal stores (and also 3-bed homes)

For larger homes - whole house protection

For Combi boilers only

Very inexpensive. Best for complying with Part L of the Building Regulations

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