This conversion was prompted for the simple reasons, extra biological surface area and easier to clean. I will explain the procedure and tools required for all those that similar filters, ideal for discus breeders etc. The tools required for the conversion: 1. Heat gun ( not blow torch that operates via gas) 2. 32mm PVC piping 3. A plumbers copper pipe cutter/ hacksaw 4. PVC cement/glue 5. Tape measure. Procedure: Cut the 32mm PVC piping into 50mm lengths. Apply heat via heat gun to one side, making sure you do not burn yourself. Also do not apply too much heat that the PVC starts burning/ going a yellow-brown color. Once heated gentle push the heated area over the disk that fits onto base and insert in a bucket of water to cool off quicker. PVC weld/glue the opposite end to the heavy base and leave to stand for 16hrs to cure properly. The sponge inserts that push inside the sponge can be PVC glued to keep them permanently together. Another idea to increase biological mass is to use another Boyu sponge filters sponge and insert to double up as illustrated. Now once the glue has cured assemble sponge and presoak the sponge by squeezing all air trapped inside sponge to prevent the sponge and entire unit from floating. If you have any questions, please feel free to ask. The reason for the increase in height was that remaining uneaten food made it difficult to get to when siphoning breeding tanks. It makes all the difference.