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If its been treated with something best to find out what, manufacture may give advice on this. For sealing damp areas around an old cottage I have been using SBR/cement slurry, very good on dusty or friable surfaces with minimal odour.

Yep, I think these have the same sort of wedge after taking one apart, perhaps its doing its job but holding onto water instead of paint? For the moment sorted the issue by leaving brushes (not ideal) inside tub overnight sealing with clingfilm, seems to work okay at least with Sandtex...

Hello good folks, Some reluctance on my part to post this as it sounds plain daft, I've even taken old brushes apart to see if there is a cavity - let me explain. After cleaning a brush usually in water it gets a good shake, rub down on dry cloth before hanging up for use the next day. What...

If it's water based, can you just not add ..water?

Thanks, I'll give it a look - btw, that was my round-the-houses way of explaining why I needed to thin paint, stretch it to finish job.

Head office had to remind the manager to respond three times before he replied, think this was more along the lines of not wanting to supply retail. Completely going off topic, the on-line shop who were super helpful supplied i litre which was short of finishing the job, no problem re-ordered...

Any advice on thinning Johnstone's WB Aqua Satin, if possible - checked web site and pdf usage guide but no clues, overall superb paint although one or two issues with actual buying. OT but vaguely relevant Contacted Johnstone's head office for help in locating a local distributor, Johnstone's...

Just looked up my old posts to see when my front door was last painted, Aug 2012 with Ruberol Satura. More for a change than anything else, picked up a tin of Colours 'One Coat' Satin from B & Q, very impressed with their matt/silk so thought it worth a shot. First off it's not water based...

This one, eBay item number: 322027121612 Complete with valves and washers.

A quick one liner in case anyone following, 18 months plus with replacement pump - no issues at all, runs at about the same noise level which is barely noticeable. Well worth considering given the cost, around 35 delivered.

Update Grundflos indicated they may start stocking replacement canisters for European customers at some point. That may take some considerable time given their overall lack of enthusiasm, in the meantime I opted for a similar OEM spec pump which is (so far) working well. Bit too early to...

If we are talking about £50 for replacement head this puts different spin on things (excuse the pun). Please provide a link for your post.

It's not at all, have you watched the video above? Once the four bolts are removed you have two options either: a) un-wire the head and replace as a complete unit ..or b) slide out the cartridge and replace. This saves on replacing unnecessary parts, saving on time and labour...

This is the point, there is actually MORE work involved in changing the head than the cartridge itself due to wiring. I think it's lack of knowledge more than anything, also if Grundfos feel they can sell you a whole new pump they will.

The best way to think about it is by parts. Grundfos have incorporated all of the moving (wearing) parts into a stainless steel canister or 'cartridge'. Think about it, why would they call it a cartridge if it was not meant to be replaced (toner cartridge, ink .... All of the electrical...

They claim the pump isn't serviceable, well at least here in the UK. I am going to write to the CEO of Grundfos and ask why.

Thanks for the helpful info, btw given the main bearing is reliant on water for lubrication would it help adding something to the water?

Dan, agreed, but this is what has been fitted to these houses or bigger! Grundfos have a database along their agents, once you give them the serial number it states 'custom OEM pump for system' - they won't deviate off of that. I could fit the lower spec 15 - 50/130 nad maybe crank it up a...

Thanks, and yes this is what has been said by several with experience. The house next door is slightly bigger but has a higher spec pump than this one. It is set at the lowest setting which possibly explains over spec. I spoke with Grundfos tech sales this morning. Bit of a shambles...

Cheers for that Andrew. I have one of units in bits which exposes the bearing. Here's an interesting thing, instead of being a regular ball race it'looks to be metal on metal but immersed in water for lube. I am therefore wondering if old coolant could hinder or wear the bearing over time...