The old Silent Large experienced a reasonably standard rubber diaphragm pump in a very tin can buried in good gravel Within the plastic circumstance. The old ones can even now be rebuilt and are available up on eBay sometimes. The 2nd to very last merchandise is labeled “Tetra AP100 (2x)” https://australian-online-aquariu78776.actoblog.com/18803437/a-review-of-aquarium-supplies-online