Underground Water Tanks: Three Problems — One Solution
Rainwater harvesting systems are becoming increasingly popular — they’re eco-friendly, cost-effective, and convenient. However, when installing underground tanks, users often face three serious issues that turn a simple project into a source of stress and extra expenses. Let’s look at these problems — and the one solution that solves them all.
1. Expensive and Labor-Intensive Installation
Many assume that installing an underground tank is cheap — especially if the tank itself is affordable. But in reality, even with a low-cost tank, installation can be expensive. Why? Because it often requires:
- A concrete foundation,
- Concrete side reinforcement,
- Heavy machinery and time.
A project that starts out as budget-friendly can become costly due to complex construction work.
2. Tank Deformation
Choosing a large tank — 8 to 10 cubic meters — increases the risk of deformation due to:
- Groundwater pressure,
- Soil mass from the sides and above.
This is especially problematic for cheap polyethylene tanks made by rotational molding. These often deform or even fail entirely.
3. Difficult Cleaning
Over time, every tank accumulates:
- Sludge and sediment at the bottom,
- Dirt on the walls,
- Organic debris and microalgae.
Tanks with deep or complex shapes — often found in rotationally molded models — are particularly hard to clean.
One Solution — The Planus Tank by Kolomaki
All these problems are solved with one smart choice — the Planus tank from Kolomaki. It’s a modern underground tank, designed to avoid all the downsides of traditional models.
Why choose Planus?
1. Installation Without Concrete
- No concrete slab or side reinforcement needed,
- Gravel base and gravel backfill,
- Quick setup without heavy labor.
2. No Deformation
- Thick-walled durable polymer,
- Reinforced ribs and supports,
- 15 mm thick top plate,
- Installed only 120–150 cm underground — minimal soil pressure.
3. Easy Cleaning
- Smooth interior surface,
- Minimal buildup of dirt and sediment,
- Simple to maintain.
Paired with the Kolomaki Rain biofilter, the system becomes even more effective: water purification, long-lasting materials, and easy operation — all in one.
Conclusion
If you want an underground rainwater tank without extra costs, deformation risks, or cleaning hassles — choose Kolomaki Planus. A reliable, strong, and smart solution that works.
Kolomaki Planus — water under control, system without worries.