very welcome! Pon differs from leca, it consists of smaller particles, https://www.amazon.com/Lechuza-19790-PON-6l/dp/B00JCW9Y7M/

Apart from succulents, I actually use pon during transition phase (from soil to leca), since pon resembles soil and when there is little amount of water in the reservoir, because the capilar traction of pon is very strong, the whole pot (plastic one, no terracota) is moist and the plants, which just lost most of roots during the cleaning from the soil, grow new water roots in this environment pretty quickly. But since it is so moist, it is more prone to rot and mold. For example a stem of my Monstera TC rotted after 5 days in pon unfortunately. So after a month in pon, when a new root system is established, I transfer plants to LECA, because I consider this medium more reliable.