Let’s look at an example. Say you’re using the Cedarwood Blanc fragrance oil, which is diffuser base approved up to 25%, and a jar that will hold 1 oz (28 g)of liquid total. Just like with measuring fragrance oils for candle making, you want to measure by weight and use a scale.
1 oz (28 g) (the size of your jar) x 25% (the percentage of fragrance you plan to use) = .25 oz (7 g) of fragrance
Now that you know how much fragrance you need, you can find out how much diffuser base to use.
1 oz (28 g) (the size of your jar) - .25 oz (the amount of fragrance) = .75 oz (21 g) of diffuser base
For CandleScience fragrances, we typically recommend a usage percentage of 25%, but check the recommended usage levels on the product page for the scent you choose.
When it comes to reed diffusers, more fragrance doesn’t always mean a stronger scent. Using more than the recommended 25% will likely cause separation and may clog the reeds. If you find that you’re not quite getting the scent throw you’d like at the maximum usage level, try adding a few more reeds.
Another great thing about reed diffusers is their longevity. A typical 1 oz (28 g) mixture with 6-8 reeds will last for around 2-3 months in an average-sized room. However, this can vary based on the size of the bottle and the number of reeds used.