We live in a terrible area for hard water, so I’ve been using bottled water to try to keep my ECM as free as possible of limescale deposits. So while our kettle and taps need regular chiselling with a road drill the cherished espresso maker isn’t bad at all after 4 years hard use.
But I’ve become aware of the in-reservoir Resin bags -BWT, Rocket, Oscar 150, (as well as ECM branded at double the price). They seem a very easy way to seriously reduce limescale. Just activate the bag under the tap, drop it in the empty reservoir, fill it up and change it in 6 months time.
But it sounds too good to be true! Do they really deliver on their promise?