My Phosphate Minus turned reddish-brown after being improperly stored. Could it have lost its effectiveness?

Yes, Phosphate Minus storage conditions directly impact its performance. If the product was exposed to moisture or air due to poor sealing, its phosphate-removal efficiency may be reduced. While it’s still safe to use in your aquarium, the effectiveness could be compromised. Always store Phosphate Minus in a tightly sealed, dry container to preserve its full potential.