Concrete Tanks FAQ

Concrete Septic Tanks

Concrete is a preferred material for septic tanks due to its inherent stability and long-term performance.

Key Benefits

Durability & Lifespan: Concrete is an extremely durable and robust material, providing a very long working life with minimal risk of structural failure from ground pressure or decay.Accordion Content
Size (Capacity): Concrete tanks can be constructed to much larger volumes than their plastic alternatives, making them ideal for high-capacity applications or larger properties.
Weight & Stability: Concrete is significantly heavier than plastic. This high density provides a crucial advantage: it resists buoyancy and floating (or ‘pop-up’) caused by saturated soil, high water tables, or heavy rainfall. This ensures the system remains stable and properly positioned over time.

Concrete Water Tanks

Concrete water tanks are widely used for rainwater harvesting and general bulk water storage, offering advantages related to purity and temperature control.

Key Benefits

Exceptional Durability and Longevity:
Water Quality and Purity:
- Concrete is chemically inert and does not taint water with metal or plastic by-products, ensuring the stored water remains clean.
- The alkaline nature of concrete can also help neutralize slightly acidic rainwater (beneficial for pipes and taps).
Temperature Control and Algae Elimination:
- Concrete is a dense material that provides excellent thermal mass, which naturally keeps the water cool.
- The combination of coolness and the ability to bury the tank means that algae growth is virtually eliminated , which in turn leads to:
  - Fewer problems with pumps, valves, and filter clogging.
Capacity and Aesthetics:
- Concrete allows for large volume capacities suitable for commercial, agricultural, or large residential needs.
- Tanks can be buried 90–100% underground. This minimises the visual impact on your property, often showing only the lid (as little as 100mm) above ground.
Environmental Profile:
- Concrete is comprised of relatively environmentally friendly materials (water, aggregate, and cement), giving it a favorable environmental profile compared to some plastics.

Essential Maintenance and Care

Consistent and proper maintenance is the single most important factor for maximising the lifespan of your concrete tank.

Water Tank Maintenance

Action	Frequency	Why It’s Critical
Full Inspection & Cleaning	Every 1–2 Years	Professionals should inspect for cracks/leaks, check fittings, remove sediment, and conduct a complete chlorine disinfection.
Visual Check	Monthly	Check the access lid for a tight seal, inspect the overflow and inlet screens, and look for any pooled water around the tank that might indicate a leak.
Test Water Quality	Annually (or after heavy rain)	Recommended to ensure the water is safe for its intended use, primarily if used for drinking.

Important Cleaning Note: If cleaning the interior yourself, never enter the tank without confined space certification and proper safety equipment, as trapped gases or low oxygen levels pose a serious risk.

Septic Tank Maintenance

Action	Frequency	Why It’s Critical
Professional Inspection	Every 3 Years	Check the sludge/scum layers and inspect baffles and electrical components (if applicable).
Tank Pumping (De-sludging)	Every 3–5 Years	Frequency depends on household size and tank volume. This prevents solids from overflowing into and clogging the delicate drain field.
Drain Field Protection	Daily	NEVER park or drive vehicles over the drain field. Avoid planting deep-rooted trees/shrubs nearby. Divert all gutter and storm water away from the area.

Septic System Do’s and Don’ts:

DO	DO NOT
Use water-efficient fixtures.	Flush non-biodegradable items (wipes, feminine hygiene products, cat litter).
Repair all leaky faucets and toilets immediately.	Pour grease, cooking oils, or large quantities of chemicals (paint, solvents, excessive bleach) down the drain.
Limit or eliminate the use of a garbage disposal.	Use septic tank additives (they are rarely necessary and can disrupt the bacterial balance).