Monolith Series 300 Stainless Filtration, stainless steel filter on a white background
Monolith Series 300 Stainless Filtration, stainless steel filter with black top and power adapter

Monolith Series 300 Stainless Filtration

$459.95incl. GST
In stock
$100.00 away from free WA delivery Free delivery over $100 in WA ($150 elsewhere in Australia).
Free pickup in KenwickOpen Tue to Sat, 12pm to 6pm

Complete the scape

Picked by our team to go with this.

About this product

Premium Filtration. Uncompromising Aesthetics.

The Monolith 300 Stainless Steel Filter is built for aquascapers who refuse to compromise. Crafted from high-grade stainless steel, it delivers powerful, silent filtration while adding a surgical-clean look that complements any rimless or high-clarity aquarium setup.

Why the Monolith 300 Stands Apart

  • Surgical-grade stainless steel – corrosion-resistant, algae-resistant, and built to last a lifetime
  • Silent operation – whisper-quiet motor ensures your aquascape remains a place of calm
  • Superior flow rate – efficient multi-stage filtration keeps water crystal clear
  • Clean aesthetic – the polished stainless finish pairs beautifully with rimless tanks and minimalist hardscapes
  • Easy maintenance – tool-free access for quick media changes without disturbing your layout

The Aquascaper's Choice

When your tank is a work of art, every component matters. The Monolith 300 disappears into your setup visually while working tirelessly behind the scenes — the kind of equipment serious aquascapers invest in once and never look back.

Specifications

  • Material: High-grade stainless steel
  • Model: Monolith 300
  • Suitable for: Freshwater planted aquariums, rimless tanks, high-clarity setups
  • Weight: ~2 kg
  • Includes: Filter unit, inlet/outlet fittings, media baskets

Compatible with standard aquarium tubing. Check inlet/outlet sizing before purchase.

Delivery and returns

Free delivery over $100 in WA and $150 elsewhere in Australia. Free pickup from our Kenwick store, Tue to Sat, 12pm to 6pm.

Returns policy

  • 5 stars: 27 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
L
Leo
Perfect

super quiet.

J
Jacob M.
Great product

Great filter. Will order again.

I
Isla Walker
Stoked

Solid build quality and great flow for the price.

C
Cooper Edwards
Couldn't be happier

Quality product.

T
Trevor Fox
Love it

Good build quality.

L
Lucas W.
Stoked

Good build quality. Will order again.

C
Craig Kelly
Love it

couldn't be happier.

N
Nathan Pearce
Fast delivery

Does the job perfectly with no noise at all.

C
Charlie Burns
Mint

Love it.

B
Bec Phillips
Top notch

spot on.

N
Nathan C.
Very happy

Best hang on filter I have used, very quiet.

O
Oliver Watson
Will buy again

Does the job well.

B
Brad Wright
Stoked

Crystal clear water.

B
Ben S.
Recommend

Top quality and great value, no complaints at all.

B
Brock Hall
Stoked

Quiet, efficient and the water is crystal clear.

M
Matt Newman
Highly recommend

Spot on.

B
Brad
Nice one

Highly recommend.

A
Archie J.
Cheers

Great product, exactly as described and well priced.

A
Aaron P.
Top quality

top quality and great value, no complaints at all.

M
Matt Parker
Recommend

fast delivery.

J
James Turner
Highly recommend

Crystal clear water. Thanks heaps.

S
Sam O.
Couldn't be happier

Really happy, water has never been this clear.

B
Bree Johnson
Happy customer

Super happy with the whole order, great stuff.

J
James
10/10

Set up in minutes and runs nice and quiet.

O
Oliver C.
Happy customer

Fast delivery. Cheers!

M
Matt Reid
Brilliant

Great quality.

A
Amelia Davies
Couldn't be happier

Very happy.