FAQs

What is it and what’s the cost?

The LimeStop is a limescale inhibitor which actually works – and is guaranteed to do so! It costs a remarkable £89!

​What’s inside?

Silicate-polyphosphate (Siliphos) spheres.

​How does it stop limescale?

Siliphos (silicate-polyphosphate) inhibits limescale formation by the phosphate sequestering calcium deposits in the water, and the silicate laying a protective layer down on the pipe surfaces.  It stops limescale formation – remember, guaranteed.

​If I buy one and it doesn’t work, you’ll give me my money back?

We would, yes.  We are the ONLY manufacturer of limescale inhibitors who will do this.  We can offer this extraordinary guarantee because we know that it works.  We’ve been making them since 2003.  Please look at other manufacturer’s products and see if they will do the same – say, ten years after you’ve fitted it.  Many ‘limescale inhibitors’ are just frauds.  The makers make fraudulent claims.

​Your LimeStop is similar to another limescale inhibitor – how is it cheaper to replace it than just refill?

Yes, the LimeStop is around half the cost of a similar device, but also works out cheaper to replace than refilling.  How so, you ask?  The cost of a LimeStop works out to 12p a day.  This is because you have to top up the other one every 6 months and refill it every year.  With the LimeStop, you simply replace it every two years.  It means that you don’t have to deal with soggy Siliphos and O rings which may not seal properly.

​So I have to replace it?

Yes, the Siliphos inside degrades (this is how it works).  It lasts two years, and therefore works out to 12p a day.  You can do this yourself if you are a diy-er, but, if not, ask your engineer to do it for you when you have your boiler serviced.

​​What size are the connections?

The LimeStop comes with 15mm compression connectors as standard, but you can specify 22mm.

​Can I protect all my other appliances, apart from my boiler?

You can, but please bear in mind that your guarantee of limescale prevention applies only to combi boilers.  But you can protect washing machines, dishwashers, and instant-heat water boilers, too, with a 15mm or 22mm version.

​What is the guarantee?

It’s that you won’t ever get limescale in your combi boiler.  The guarantee applies after a LimeStop has been fitted for 3 years and has been replaced.  If you should get limescale, we would obviously require proof that satisfies us, and we would return your original purchase cost back to you.

​Have you ever had to pay out on your guarantee?

No.  We’ve been manufacturing limescale inhibitors for 23 years, and we have NEVER had a claim!

​What do you think of other limescale inhibitors?

If they worked, then we would sell them!  NOTHING else, other than the silicate polyphosphate which is inside our LimeStop will successfully stop limescale apart from a full-blown water softener.  We know because we have tried them over our 40 years of being in business.  If you think they do work, then ask them if they will refund you after 10 years if you get limescale formation.  We know that they won’t!

​Can I return it if I can’t make it fit?

Not if you’ve opened the box.  This is because of hygiene reasons.  The safety of our products with regards to that are paramount, so we can only accept a return if you haven’t actually opened the box.  Just send it back to us (you have to pay the postage) and we will refund you your purchase cost minus the postage.  This applies up to 14 days from purchase date.  Use a courier which tracks your parcel.

​​​​Should I get a plumber to fit it?

It is well within the scope of any competent diy-er.  You shouldn’t normally require any other fittings, but we do advise that you install it while plumbing supply stores are still open, just in case you need any other fittings.  If you’re unsure, then ask a local plumber to install it for you – he will know if you also need a non-return valve fitted to your mains water.  It should take no more than 20 minutes or so.

​Why would I need a ‘non-return valve’?

EVERY piece of equipment fitted to a mains water supply should be prevented from ‘contaminating’ the water supply – so a non-return valve inhibits your water going back into the drinking mains.  However, lots of homes already have them fitted, and you shouldn’t have two in series.  It’s a small brass device fitted after your mains stopcock and costs about £3-5.

​Can I collect one, rather than ordering?

You can.  We are at 19 Cockney Hill, Reading. RG30 4HF.  Telephone us first on 0770 231 6157.

​Is there a discount if I order three or more?

Yes, email us and we’ll arrange a discount payment for you if you are ordering three or more.

​What are the instructions for fitting the LimeStop?

Just ensure that your mains water isn’t very high pressure – like over 4 bar.  If it is, you will require a pressure limiting valve – set to 3 or 4 bar.​

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ORDER VIA INVOICE…

Simply fill in the form below and we will raise an invoice for you to be sent to your email address.  Remember – available with either 15mm or 22mm connections – please specify.  If you have any issues or questions, please email us on info@scalgon.co.uk

Information

Shipping info:

Delivery is free – we absorb the costs within the product cost.  All our products are sent by Royal Mail 48 and are tracked.  Delivery is sometimes within 48 hours, but more usually 72 hours (three working days).  If you haven’t received your parcel after four WORKING days, please email us.  We will contact Royal Mail to ascertain what has happened.

​Product info:

The LimeStop is a limescale inhibitor to halt limescale formation within combination (combi) boilers.  It is not made for any other use, though it is sometimes purchased to protect other water heating appliances.  The pipe connections are 15mm compression as standard.  The LimeStop will require replacing after two years.  We will contact you when this date is near if we have your address details.

​Refunds & Returns policy:

As our products are covered by hygiene regulations (within the ‘Distance Selling’ consumer rights) you cannot return the product once the box has been opened.  Please note that if we believe the box has been opened then you would not receive your money back if you returned the product to us, and you would require to pay a courier fee for us to send it out to you again.  However, if you make a purchase by mistake – and you have not opened the box – then return the product to us for a full refund MINUS postage costs (which is currently £5).

​Guarantee:

There is a guarantee on our product that it will halt limescale formation.  This guarantee applies after the device has been installed for THREE years.  If your combi boiler has ‘scaled up’ after this time and you have already replaced the unit, then we will return your original purchase cost (£89 as of September 2025 minus of postage).  PLEASE NOTE that we must know where the device has been fitted, so you MUST email us with your name, address, and (preferably) a mobile telephone number.  This ensures that we know where the product is fitted, and that we can contact you.  If we don’t receive that information within 28 days of purchase then your guarantee will not apply – only your statutory rights will apply.

​Your privacy:

We will keep a record of where the device is installed.  However, this will merely be your name, address, and/or your telephone number/email address.  We need this to contact you in two years, and for your guarantee.  This information is not open for public viewing and is stored on a computer which is not connected to the internet.  At no time would we divulge any of the information to anyone unless ordered to by a UK court of law.  Please note that if you contact us to request what information we hold about you, we can only talk to you via the telephone number and/or the email address originally supplied.  This ensures that your information is always held safe with us.

​This website contains information which is relevant at the time it was last compiled – September, 2025, and is subject to change.  Prices may change without notice.  Terms and conditions contained in this website may change without notice.

19 Cockney Hill, Reading. RG30 4HF

T. 0770 231 6157

© 2026 LimeStop