Packing Pellets and Plants

Slightly off-topic, but it is for a citrus tree...I have an oversized "planter" (a tall wooden crate) that I want to use for a Mexican Lime. I want to fill the bottom half with something much lighter than rocks, and to that end have collected some packing pellets from work: some pink s shapes and white pellets.  Does anyone know if these will harm my citrus?  The whites dissolve in water, so won't be particularly useful, but how do I tell if the pinks are poisonous? 

Thanks

Carol
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