How Syringes Work
Syringes are small nozzle ended plastic tubes containing rubber-ended plungers. The tubes have markings for accurate measurement. When the nozzle end is placed in a liquid and the plunger is pulled out, the syringe will suck the liquid into the tube and the markings show how much liquid has been drawn out. The nozzle end of the syringe can then be taken out of the liquid and the surface tension in the nozzle will retain the liquid inside the tube, preventing it from dripping out. The measured amount of liquid can then be added to a reservoir by simply pressing the rubber-ended plunger back down.
How to Use Syringes
Syringes can be used in the above manner to measure out almost all types of liquid. The syringe can be re-used many times but we strongly advise rinsing the inside and outside of the syringe with water in-between measuring out different liquids to prevent cross-contamination of your plant-food bottles. Syringes are not suitable for measuring out pH adjustment products (pH down acid and pH up alkalis) because they are very caustic by nature and will perish the rubber seal on the end of the plunger very quickly, drastically reducing the lifespan of the syringe. For pH adjustment products we would recommend the use of one of our pipettes instead. Syringes may also be difficult to use with very thick and viscous liquids because they will resist being sucked up through the small nozzle. For viscous liquids we would generally recommend a measuring beaker instead.