Recommended amount of fertilizer to mix with water

I recently puchased the "HollandBasics Premium Bloom Booster 15-30-15 - Water Soluble Fertilizer" through Amazon. I am planning on using this with soil for my Hoyas.  I see the text in your description where it says "Mix the recommended amount of fertilizer with water and apply to your plants during the flowering and fruiting stages for optimal results", but nowhere does it day what the recommend amounts should be? 1 tsp per 1 liter water?  or????

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