A water fountain persuades many cats to drink more, because cats are drawn to moving water — but the fountain only keeps that promise while its water is fresh, and freshness is a maintenance product, not a feature of the purchase. Within days, every fountain grows biofilm: the slippery, almost invisible layer coating surfaces and flavouring the water passing over it. Cats taste the change before owners see it — hence the puzzling sight of a cat ignoring expensive running water to drink from a tap. The remedy is a weekly rhythm of teardown, scrubbing, and pump care, done thoroughly enough that water at week's end tastes as clean as at its start.
The Weekly Teardown, Surface by Surface
Once a week, switch the fountain off, empty it completely, and take it fully apart: bowl, housing, trays, spouts, and covers. Wash each piece in hot water with a brush reserved for the fountain, getting into the corners, seams, and channels where slime builds up most; the job is done when surfaces feel squeaky rather than slick. A little washing-up liquid is acceptable on hard parts if you rinse exhaustively, since cats refuse water carrying a trace of soap, and residue is the usual reason a cleaned fountain gets ignored. In hard-water homes, a soak in diluted white vinegar lifts mineral scale, followed by the same thorough rinsing. Keep the pump and anything electrical out of the soak unless its maker explicitly allows it.
Inside the Pump: The Impeller Does the Work
The pump is where most fountains fail. Open its cover and lift out the impeller — the small bladed rotor on a magnetic spindle that does all the moving. Hair wraps around that spindle, grit lodges between the blades, and the intake slits fur up with debris, and each quietly strangles the flow. Clean impeller and housing with a small brush, rinse away what you loosen, check the spindle spins freely, and reassemble the pump as it came apart. A stream dwindled to a dribble usually returns to full flow after this one job — dirt, not wear. A pump still running weakly or noisily after a proper clean has usually reached the end of its working life.
Filters, and the Daily Top-Up Between Cleans
The filter traps hair and debris before they reach the pump, and it works on a clock: rinse it beneath a running tap at each weekly clean, and replace it on the rhythm its maker states — for most fountains, guidance runs to every few weeks, varying with how many cats drink from it. A filter left in far beyond its rhythm stops filtering and starts contributing: saturated media grows its own biofilm and flavours the water it was meant to freshen. Rinse a new filter before fitting it if the maker directs, since loose carbon dust clouds the first fill. Between teardowns, top up daily with fresh water rather than letting the level creep toward the pump's minimum, and wipe the drinking surface midweek if it feels slick. Site the fountain away from the litter tray and clear of the food bowls; litter dust in a reservoir undoes your cleaning within hours.
Reading the Signs That Freshness Has Slipped
Your cat audits the fountain daily. A cat who returns to taps, glasses, or a plain bowl while the fountain runs is voting on flavour, and the vote usually means biofilm has won the week. Slimy surfaces, a sour smell at the waterline, a weakened stream, or any film in the reservoir all say the same thing: clean now, ahead of schedule. Note each filter change date somewhere durable; a filter that feels recent is often two months old. The pattern that keeps water fresh is unglamorous — teardown weekly, pump opened every time, filter changed on rhythm — and it holds when it is written into the household's ordinary rota. That weekly clean sits naturally among the other recurring jobs in KinsLe, where Care Teams lists it beside feeding and litter duties with a name against it.