Here you go :-
I purchased it from here
https://m.ebay.com/itm/SERA-SIPORAX-Pond-25mm-Filter-Media-for-Aquarium-and-Live-Coral-/222657544839?var=&hash=item33d76c8287:m:mIhZkfHML-qfLPjdUy8lnOA&_trkparms=pageci%3A0c5d6808-b9d5-11e7-8f91-74dbd18046c5%7Cparentrq%3A55aeb74915f0a86642af4369fffeeee1%7Ciid%3A1
Here's my crappy pic as my sump light conked out . I wish I had more place but my bubble King takes away all space .
Regards,
Abhishek
awesome, thank you!