Simple physics, no moving parts. SilentDry stones are made from natural silica sand with a biodegradable patented formula, filled with nano-pores that draw water vapour from the air — quietly, safely and over and over again.
Air always carries water vapour. In a closed space, that moisture settles on clothes, gear and surfaces — causing mould, musty smells, rust and lens fungus.
Each SilentDry stone is filled with a large amount of nano-pores with strong moisture absorption and regeneration ability. Inside a confined space it absorbs moisture slowly and steadily, keeping humidity below 60% RH rather than saturating all at once.
Because the process is passive, there is no fan, no compressor and no power cable — and therefore no noise and no running cost.
Unlike granular silica gel, which absorbs rapidly and reaches its limit quickly when exposed, SilentDry stones work best in enclosed spaces — drawers, cabinets, cases, bags and safes — where they keep things dry slowly and efficiently. In an enclosed space the stone can stay effective for around 30 days even if opened to airflow daily. They are not recommended for open spaces such as an open bathroom.
Tested to be renewed at least one hundred times — recharge in minutes instead of throwing away.
A colour indicator on the frame gradually turns blue when the stone has absorbed enough moisture (humidity of 60% RH or above).
Dry the stone in a microwave or oven. Only moisture is released — the raw materials are natural and non-toxic. Sunlight only dries the surface, so oven/microwave is recommended.
Once dry, the indicator resets and the stone is ready for another cycle — for years.
Anywhere a closed space lets moisture build up — typically 5–150L.
Closets, drawers, shoe boxes, bookshelves, spice racks, food containers, kitchen and bathroom cabinets.
Tents, backpacks, sleeping bags, boots, tool boxes and boats.
Camera bags and dry boxes (30–50L) — stops fungus growing on lenses.
Gun safes, cases and ammunition storage — prevents rust and corrosion.
Gym bags, fishing tackle, archery cases and hunting equipment.
Documents, electronics, instruments and collectibles in closed spaces.
One reusable stone replaces hundreds of disposable sachets. Natural decomposition rate over 99.8%.
No electricity means no bills, no wiring and total silence — ideal for bedrooms and studios.
SGS tested; compliant with EU REACH, US California Proposition 65 and FDA standards.
Recharge in minutes and keep protecting your gear for years.