Gallery, Projects and General > How do I??

One for the Chemists - water softening solution.

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awemawson:
Well amazingly some RM110 Karcher water softener fluid has turned up on eBay. This is the stuff recommended for the MPDS precursor the  HDS 1000 DE :thumbup:

I shall order some and try it for conductivity :coffee:


https://www.ebay.co.uk/itm/KARCHER-Water-Softener-RM-110-For-HDS-Hot-Pressure-Washer-6295625-6-295-625-0/192429550659?hash=item2ccdb1ec43:g:CYQAAOSwLF1X2Se4

PekkaNF:
That's interesting...it says no phosphates...and the stuff I keep on bumping on this total loss system is hexametaphosphate. Like here:
https://www.plumbingsupply.com/scale-inhibitor.html


And  where it leads me:

pH control

Another vital parameter in water treatment is controlling the pH of the water. Due to their buffer (pH regulating) capacity, orthophosphates and purified phosphoric acid can keep the pH level of the water as constant as possible.
Corrosion inhibition

Phosphates are used to reduce corrosion in water mains. This may be either anodic corrosion or cathodic corrosion.

Limescale inhibition — softening agents

Hard water causes the build-up of limescale deposits in pipes, leading to a lower water flow rate and therefore higher pumping and cleaning costs.
Polyphosphates can trap calcium and magnesium. Calcium is the source of limescale formation and can dissolve the compounds formed, which prevents deposits from building up. Depending on the pH of the water, preference will be given to either SHMP (sodium hexametaphosphate) or STPP (sodium tripolyphosphate).

http://www.prayon.com/en/our-activities/products/industrial-applications/water-treatment.php

But the karcher stuff is phosphate free...There may be different chemical systems, I could ask my friend. He used to work with power plants ans he is now in a company that makes water treatment systems for ships. Scale problems with boilers should be pretty analogous to this hot water washer heater - I think.

So, is it possple that karcher pump or boiler materials don't like phosphates? That leaves two more options: Polyelectrolytes and chelatants.
http://www.chemtreat.com/solutions/scale-deposition/

Could it be one of these?


Pekka

awemawson:
Yes Pekka, the phosphate free bit was the first thing that struck me.

I've no doubt this stuff will work in the sense that if introduced into the water it will prevent calcium deposits. What I don't know is if it's electrical conductivity will be sufficient to pass enough current between the sensor electrodes that detect an empty tank (no current flow between electrodes). The electronic valve timer module is inhibited if an empty tank is detected.

A quick test will soon show though  :clap:

These inhibitors don't remove existing calcium deposits, so I will probably set it up to recirculate a phosphoric acid solution by letting it suck it's feed water from a (plastic) bucket, and having removed the 0.6 mm nozzle from the lance let it pump back into the bucket.

naffsharpe (Nathan):
Andrew, have you thought of using " Bore Saver" from Geoquip in Ipswich ? We've used it for years for cleaning borehole pumps of scale. These pumps have been either landfill or domestic sites. Mike Deeds who owns Geoquip will only sell kit that works.
Nathan.

awemawson:
I'll go do a bit of Googling  :coffee:

Thanks for the link - meanwhile I've been advised that the RM 110 is 'dispatched, so I wait with bated breath

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