What you're actually comparing
Marbelite is not a shell — it's the cementitious marble-dust plaster troweled onto a concrete pool's interior. So this comparison is really 'concrete shell with a marbelite interior' vs 'factory-moulded fibreglass shell with a gel-coat surface'. The structural assumptions differ, and so does the maintenance cycle.
Upfront cost (2025 ZAR, mid-size pool)
For a 7 × 3.5 m family pool on a level metro site:
- Marbelite-finished concrete: R260,000 – R650,000 turnkey
- Fibreglass: R190,000 – R420,000 turnkey
- Delta: fibreglass is 25–35% cheaper on average
Lifespan and re-surface cost
A correctly waterproofed concrete shell lasts 30–50 years. The marbelite interior is the consumable: expect to resurface at 10–15 years for R45,000–R95,000 on a mid-size pool, more if the rebar has spalled.
Fibreglass gel-coat life is 15–25 years; full re-gelcoat is R65,000–R140,000. Osmotic blistering on cheap imports can shorten that materially.
Feel, finish and visual appeal
Marbelite reads as a softer, more matte 'real-pool' finish — water tone shifts subtly with the plaster colour (white, beige, blue-grey, charcoal). Fibreglass gel-coat is glossier and more uniform but has fewer colour options and shows ageing earlier. Both feel smooth underfoot when new.
Resale and surveyor impact
Bond surveyors and home-inspection reports rarely flag the shell type, but they do flag the interior condition. A 14-year-old fibreglass with no gel-coat work and a 14-year-old marbelite needing resurfacing both knock R30,000–R80,000 off the buyer's offer — plan the refurb before listing.
Sources
- South African Plasterers' Handbook — Cement & Concrete SA