This type of slow release fertilizer is imported from usa. 
It has very low Phosphorus concentration which reduce the risk of causing fertilizer burn to the roots of the plants. 
The fertilizer is long lasting and can last for around 5-6 months. 

Usage: around 3-4 pallets for 2.5" pots
around 4-5 pallets for 3.5" pots. 

Suitable for all orchids plants.

Nutricote 14-4-14 180 day time release fertilizer 100g pack