Question 1

What is a domestic grease trap?

Accepted Answer

A domestic grease trap is a compact FOG interceptor fitted under or near the kitchen sink. It is the first line of defence so fats, oils and grease do not foul septic or wastewater treatment systems further down the plumbing network.

Question 2

What sizes does the GRAF under-sink grease trap come in?

Accepted Answer

GRAF Australia lists 50 L and 80 L under-sink units (order nos. 108128 and 108129). Example envelope: 50 L ≈ 520 × 355 × 475 mm at 3.6 kg; 80 L ≈ 600 × 410 × 610 mm at 5.7 kg.

Question 3

Is an under-sink grease trap the same as a commercial grease trap?

Accepted Answer

No. Under-sink units suit homes and smaller restaurant kitchens with light FOG loads. Busy commercial kitchens usually need Sapphire, Grease Arrestor SC or similar capacity with pump-out access.

Question 4

Do I need a domestic grease trap for a home kitchen?

Accepted Answer

If kitchen wastewater feeds a septic or on-site treatment system, FOG protection is often recommended so treatment stays effective. Confirm with your plumber and local rules. Mains sewer homes may still benefit where grease load is high, but authority rules vary.

Question 5

Can I use an under-sink trap in a cafe?

Accepted Answer

Only for compact / light FOG loads. Catalogue copy positions under-sink for homes and smaller restaurant kitchens. If covers and fryer load are commercial, specify Sapphire or SC instead.

Question 6

How do I choose 50 L vs 80 L?

Accepted Answer

Match expected FOG load and available cupboard space. When in doubt, share fixture count and kitchen type with GRAF Australia for a recommendation; do not undersize.

Question 7

When is an under-sink grease trap enough?

Accepted Answer

Under-sink units suit compact or light FOG loads. Busy commercial kitchens usually need a larger arrestor such as Sapphire. GRAF Australia will confirm from your hydraulic brief.

Question 8

Where can I buy a domestic / under-sink grease trap in Australia?

Accepted Answer

Through GRAF Australia (grafaustralia.com.au) or authorised trade partners. Call 1300 131 971 for state sales support.

Question 9

What if I need a larger commercial arrestor?

Accepted Answer

See Sapphire Grease Trap (600-1,500 L), Grease Buster (above ground) or Grease Arrestor SC (2,000-10,000 L), and the commercial grease trap Australia guide.

Size	Length	Width	Height	Weight	Order no.	Quote
50	520 mm	355 mm	475 mm	3.6 kg	108128
80	600 mm	410 mm	610 mm	5.7 kg	108129

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