Quick answer

To refill a BYREDO hand wash foam dispenser, pour the refill liquid into the dispenser bottle, then top off with water up to the fill line (usually a 1:3 or 1:4 ratio of soap to water). Gently swirl—never shake—to mix. This preserves the foam pump mechanism and ensures a rich, consistent lather.

Why dilution matters for foam dispensers

BYREDO hand wash refills are concentrated liquid soaps designed to be diluted with water in foam dispensers. Unlike standard pump bottles, foam dispensers rely on a specific viscosity to aerate the soap properly. Too thick and the pump clogs; too thin and you get watery foam. A 1:3 or 1:4 ratio (one part soap to three or four parts water) typically yields the ideal foam density. Always check your dispenser's fill line if it has one.

Choosing the right dispenser

BYREDO sells dedicated foam dispensers for their hand wash refills, but you can also reuse an empty BYREDO foam dispenser. Avoid using non-foaming pump bottles—they won't create the same lather and may dispense too much product. If you're reusing a dispenser, rinse it thoroughly before refilling to prevent old soap residue from affecting the scent or consistency.

Step-by-step: Refilling your BYREDO foam dispenser

  1. Empty and rinse the dispenser: Remove the pump and pour out any remaining soap. Rinse the bottle with warm water. Do not use soap—residue from a different scent can alter the fragrance. Common mistake: Leaving old soap in the bottle can cause clogs or a muddy scent blend.
  2. Add the refill concentrate: Pour the BYREDO hand wash refill into the bottle up to about one-quarter of the bottle's capacity. For a 250ml dispenser, that's roughly 60-70ml of concentrate. Checkpoint: Use the fill line if your dispenser has one—it's calibrated for the correct ratio.
  3. Top off with water: Fill the rest of the bottle with room-temperature filtered water. Leave a small air gap at the top so the pump can draw liquid properly. Common mistake: Using hot water can degrade the soap's fragrance; cold water may not mix evenly. Room temp is best.
  4. Swirl gently to mix: Screw the pump back on and tilt the bottle side to side several times. Do not shake—shaking introduces air bubbles that can cause the pump to sputter or foam inconsistently. Verdict: A gentle swirl ensures a uniform mixture without compromising the foam mechanism.
  5. Prime the pump: Pump a few times into the sink until foam appears. If nothing comes out after 5-6 pumps, check that the dip tube is submerged and that the pump isn't clogged. Next step: Once primed, your dispenser is ready for daily use. Enjoy the rich, silky foam.

Products that pair well with this guide

  • Tree House: Diffusing throughout every corner of your home, experience the signature fragrances from Byredo in fresh designs and reimagined formats. Transform the atmosphere of your space instantly with our generous 250ml Room Spray. Housed in sleek black glass with our signature white label, just a few quick sprays envelop the furthest corners of your living room, bedroom, or entryway with the scent of Tree House. While not a hand wash, the Tree House Room Spray complements your bathroom ritual by layering the same olfactory experience—spritz it after washing your hands for a lingering scent that ties the room together.
  • La Sélection Nomade: La Sélection Nomade presents three iconic fragrances—Bal d'Afrique, Blanche, and https://byredout.com/products/gypsy-water-306725https://byredout.com/products/gypsy-water-306736https://byredout.com/products/gypsy-water-306741Gypsy Water—each housed in a convenient 12ml vial, for an on-the-go use. If you love variety, these travel-friendly vials let you sample the scents that match your hand wash refill, so you can coordinate your fragrance wardrobe from sink to skin.