By Matthew Baring-Gould, Kingscliff-based drainage plumber. Servicing Tweed Heads for 4 years. 5.0 stars across 173 Google reviews. Licensed NSW 383340C and QLD 15036450. ABN 74 605 392 348.
Three Banora Point shops shared a main sewer line. One unit had been vacant long enough that sediment had settled on an old earthenware bend. The sediment caught paper, the paper trapped more, and the whole three-shop sewer blocked back to the first toilet.
What the customer called us for
Real estate agent managing a Banora Point block of three commercial units called us out. The main sewer serving all three shops had blocked and the toilet in the end unit was unusable.
What we found when we got there
Camera showed the blockage sitting at an old earthenware bend. The bend had sagged slightly over years and the inside of it had become a low point. One of the three units had been vacant long enough for fine sediment to settle in the belly of that bend. Once there was a shelf of sediment, paper caught on it, more paper caught on that, and the line choked back to the farthest toilet.
Why we did it this way
On commercial sewer lines serving multiple units, low usage on one unit is often worse than high usage. Water movement keeps lines clean. A vacant tenancy creates still water, still water drops sediment, and sediment is where cascade blockages start.
What we did on site
- Cleared the immediate blockage with the hydrojet so the shops could reopen.
- Ran the CCTV camera the full length of the shared sewer.
- Flushed the earthenware bend thoroughly to lift the settled sediment back into free-flowing water.
- Documented the sagging bend on the report so the owner has a long-term repair path.
- Advised the real estate on filling the vacant unit (or flushing the line weekly) to prevent the same cascade.
The result
Line reset to free flow. All three shops open. Owner and real estate now know the earthenware bend is the structural weak point and can budget for a dig-up repair at the next lease break.
If you have the same issue
If you manage commercial units with shared sewer and one of your tenancies has been vacant for a while, book a camera-and-jet before you re-lease. A cascade blockage on day one of a new tenancy is a very fast way to lose the tenant. Call Matty on 0447 188 394 or request a quote.
Customer names and addresses have been withheld. Individual results vary. Drain Masters Plumbing is licensed in NSW (383340C) and QLD (15036450).
Frequently asked
Is earthenware pipe always a problem?
No. Earthenware runs are still structurally fine on thousands of commercial buildings. The problem is the bends and joints. Straight runs can last a century. Bends sag over time and become sediment traps.
Why does a vacant unit cause a blockage in the other units?
Because all three shops share a line. The unit nearest the main is where sediment collects. Water from the busier units has to pass over the sediment. The moment paper or wipes catch on it, the whole line chokes back to the first toilet.
What is the long-term fix for a sagging earthenware bend?
Expose the bend, cut it out, replace with PVC. Half-day job depending on access. Done once, lasts the life of the slab above.
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