We fitted a water softener and the tea got worse

In short

A domestic ion-exchange softener does not take minerals out of water. It swaps calcium and magnesium for sodium, so the total dissolved load is unchanged and only its composition has moved — which is a different intervention from filtering, and it happens to be the wrong direction for tea.

Likely causes, in order

Most likely first. Answer the question under each one before moving on — several of these look alike in the cup and are told apart only by what was done to the leaf.

1. 1. The softener exchanged hardness for sodium rather than removing it

   Water chemistry

   Check: Is it a salt-regenerated softener plumbed into the mains, rather than a filter jug or an under-sink cartridge?

   Fix: That is what this equipment does, and it was fitted to look after pipes and appliances rather than tea. The dissolved load reaching the leaf is the same; the ions are different, and the cup goes flat and faintly saline. Filtering is the different operation that actually reduces the load.

2. 2. There is usually an unsoftened tap and nobody mentioned it

   Equipment

   Check: Is the kitchen cold tap plumbed before the softener? Many installations deliberately leave one drinking tap hard.

   Fix: Fill the kettle from the unsoftened tap if there is one, which is the cheapest possible fix and frequently already available. If you do not know, taste water from each tap side by side — softened water has a recognisably slippery mouthfeel.

3. 3. A filter jug on top of softened water is doing very little

   EquipmentInferred by TeaHQ, not established

   Check: Have you responded by running the softened water through a filter jug and found it barely helped?

   Fix: Filter jug cartridges are aimed largely at carbonate hardness and chlorine, and the softener has already removed the first. Bottled low-mineral water for tea, or a reverse-osmosis tap, are the interventions that change the outcome here.

4. 4. Not all of the change is the water

   Water chemistryInferred by TeaHQ, not established

   Check: Did the scale in the kettle also disappear around the same time?

   Fix: A newly descaled kettle changes the cup too, and both changes arrived together. Boil a kettle of softened water and a kettle of the old supply and brew the same tea in both before concluding — this is a comparison worth doing properly because the remedy is expensive.

Brewing methods this applies to

• Western brewing (teapot or mug) — A small amount of leaf in a large volume of water, steeped once for a few minutes and then strained off. The approach most English-speaking drinkers already know, and the one most teas sold in the West are made for.
• Tea bag brewing — Pre-portioned tea in a permeable bag. The format was an accident of early twentieth-century sampling practice and became the dominant way tea is drunk worldwide, because it removes every decision except how long to leave it in.

Related problems

Sharing a cause category, a tea type or a brewing method with this one.

• My tea tastes of chlorine, metal or the kettle — A chemical, swimming-pool or metallic note sits over the tea, and it is there whichever tea is brewed.
• My teapot came out of the dishwasher damaged or tasting wrong — A pot or cup returns from a dishwasher cycle dulled, with faded decoration, a fine web of surface cracks, or a persistent taste that was not there before.
• I bought a water filter for my tea and it changed nothing — A filter jug or tap filter was bought specifically to improve the tea, and the cup tastes the same as it did before — with the same dullness, the same film and the same scale in the kettle.
• My green tea tastes flat and looks dark in this house — A delicate green tea that tasted bright elsewhere comes out dull and heavy here, with a darker, browner liquor than it should have and none of its aroma.
• My tea tastes flat and I reboiled the kettle — A cup made from water that had already been boiled once tastes dull, and the internet is confident that this is why.

Sources