Wet-Dry vs Canister vs Sump Filtration Comparison Guide
Beyond the beginner debate of HOB or sponge sits the bigger-tank question that catches every intermediate hobbyist out: wet-dry trickle, sealed canister, or full sump. A proper filtration system comparison at this tier is less about flow numbers and more about biological capacity, oxygen exchange and aesthetic concealment. This guide from Gensou Aquascaping at 5 Everton Park puts the three architectures side-by-side for tanks above 150 litres, with cost, footprint and maintenance reality. The filtration system comparison below applies once a single canister starts to feel undersized.
Quick Verdict
Sump for any tank above 250 litres or any reef build — unmatched biological volume and equipment-hiding capacity. Canister for 100-250 litre planted and community tanks where sealed silence wins. Wet-dry for high-bioload African cichlid or arowana setups where oxygen exchange and raw nitrification matter most.
Wet-Dry Filtration: The Trickle Classic
Wet-dry filters expose biological media to air via a drip plate, drowning bio-balls or ceramic noodles in falling water. Oxygen saturation hits ridiculous highs and aerobic nitrifying bacteria thrive — perfect for ammonia-heavy systems. The classic Eheim Wet/Dry and DIY trickle towers were the standard 1990s discus and Tanganyikan setup. SGD 200-450 for a hang-on or top-mounted unit. The downsides are noise (trickling water), evaporation rate, and the dated aesthetic.
Canister Filtration: The Sealed Workhorse
Canisters seal water under pressure through media trays in a closed loop. Eheim Pro 4+, Oase BioMaster Thermo and JBL CristalProfi e1502 cover the upper bracket from SGD 350-700. Silent operation, hidden cabinet placement and trayed media swap make canisters the modern standard for planted tanks and showpiece community builds. Biological capacity is bounded by canister volume — typically 6-8 litres of media in a top-tier unit. Browse the filter and pump range for current models.
Sump Filtration: The Custom Champion
A sump is an auxiliary tank below the main display, plumbed via overflow weir or hang-on overflow box. Water gravity-feeds down, passes through filter socks, refugium chambers, biological media and a return pump that lifts it back. SGD 400-2000 depending on whether you DIY-cut acrylic or order custom from Carousell sellers. Biological capacity is essentially unlimited, you can hide heaters, skimmers and reactors out of sight, and water-volume-to-system ratio jumps 30-40 per cent — diluting any spike.
Side-by-Side Specifications
For a 300-litre community: a wet-dry handles 1500 L/h with 3-4 litres of bio-media at SGD 350, audible. A canister pushes 1500 L/h with 7 litres of media at SGD 600, silent. A sump processes 2000 L/h with 15+ litres of media plus refugium space at SGD 800-1200, near-silent depending on overflow design. Maintenance: wet-dry monthly bio-ball rinse, canister quarterly, sump fortnightly sock change but quarterly deep clean.
Decision Framework
Tropical community 100-200 litres — canister, every time. African cichlid colony 250 litres with 30+ fish — wet-dry or sump for raw bioload. Reef tank — sump, no debate, for skimmer placement and refugium. Planted aquascape 200-400 litres — large canister or sump with dedicated refugium for shrimp. Arowana or stingray 500+ litres — sump for water volume and equipment concealment.
Singapore Sourcing
Eheim and Oase canisters are stocked at C328, Iwarna and Petopia. Wet-dry units are mostly DIY or Shopee import these days. Custom sumps are the speciality of Carousell sellers in Woodlands and Bedok who cut acrylic to your cabinet dimensions for SGD 250-500. Pair with a Jebao DCT return pump in the SGD 100-180 bracket. The aquarium tank range at Gensou occasionally bundles cabinet-ready sump configurations.
Common Mistakes
Sizing the return pump wrong is the universal sump error — too weak and the overflow gurgles, too strong and water level fluctuates. The wet-dry mistake is letting bio-balls dry out during cleaning, which kills the bacteria colony in 30 minutes. The canister mistake is over-packing media so flow chokes to a trickle. Whatever architecture you choose, plan media replacement in stages — never strip the entire bed at once.
Related Reading
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Still Have Questions About Your Tank?
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5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
