simonc -
simonc I presume this means that there is still a lot of scale left?
Right. So…
- Epsom salts WILL cause scale. It’s essentially Magnesium Sulphate.
- TDS is not necessarily associated with limescale. For instance, if you add approx. 100mg of sodium bicarbonate to 1L of ZeroWater, you’ll get a reading around 50ppm.
- Are you waiting for the water to cool down when measuring TDS? TDS will read significantly higher in warm/hot water.
It might be that the sediments are being dissolved in the solution of citric acid, but there’s some left at the bottom, because the hot water pipe doesn’t go all the way down to the bottom of the boiler - so something will always be left behind.
If you want to be 100% sure, remove a fitting - i.e.: vacuum breaker, temp probe, use a hose/tube that fits and syphon the water out.
Try to visually inspect the inside of the boiler and see if there’s any limescale build up. If t here is, you might as well fill up the boiler with descale solution, wait a few hours and then syphon it out again.
Give it a flush with water, syphon the water out again and hopefully it should be all fine.
Don’t bother with the epson salts again…. And you’ll never need to descale your machine ever again.
