Water Filter Jugs Compared by Capacity, Cartridge Life and Price

A quality water filter transforms tap water by removing chlorine, limescale, and other impurities that affect taste and can damage your kettle or coffee machine. The right filter depends on your household size, water hardness in your area, and how much filtered water you use daily. Most UK households benefit from jug filters rated for 150 litres or undersink systems that provide instant filtered water at the tap.

Capacity matters significantly—standard filter cartridges last 4-6 weeks or roughly 150 litres before replacement, whilst some premium options extend to 200 litres. Look for filters certified to reduce specific contaminants like chlorine (which affects tea and coffee flavour), limescale (particularly important in hard water areas across the South and East), and heavy metals. Jug filters typically cost £3-8 per cartridge, making running costs around £40-100 annually depending on usage.

Many people make the mistake of keeping filters beyond their stated lifespan, which reduces effectiveness and can harbour bacteria. Mark your calendar when installing a new cartridge, and always flush the first two litres through when fitting a fresh filter. If you're in a hard water area, consider filters specifically designed for limescale reduction to protect your appliances and improve beverage quality.