A calm upper water surface
The polished top allows the water to collect and spread across a smoother stone surface before reaching the edge.
3 - 6 Day Delivery
(H) 20cm x (DIA) 40-45cm
EXPERT HELP
Speak to a water feature specialist about size, positioning or installation before you order.
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Manchester showroom or virtual.
BOOK A CONSULTATIONA substantial piece of natural basalt with a polished dished top and rugged outer surface, creating a water feature where refined stone meets raw volcanic character.
Measuring approximately 40–45cm across and around 20cm high, this Caldera has a broad, low-profile form rather than the tall proportions of a traditional column.
Water bubbles gently into the polished dished top before spreading across the smooth stone and cascading over the edge onto the more rustic sides below.
Each piece is formed from genuine natural basalt, so shape, texture and colour vary from one feature to another. Rich charcoal, black and brown tones become noticeably deeper as water moves across the stone.
The combination of a smooth polished top and rugged basalt exterior creates a different character to both conventional babbling boulders and uniform polished stone features.
The polished top allows the water to collect and spread across a smoother stone surface before reaching the edge.
The more rustic sides retain the irregular texture and visual depth of genuine natural stone.
Natural variations in shape, colour and texture ensure that every Caldera has its own individual appearance.
Water rises through the basalt and gently enters the polished dish formed into the upper surface.
The shallow dished area allows the water to spread and move across the smooth stone before reaching the outer edge.
From there it cascades over the more irregular basalt sides, creating a contrast between the calmer movement above and the broken, textured flow below.
Unlike the taller Caldera columns, this basalt design sits relatively low to the ground at around 20cm high.
Its substantial 40–45cm natural diameter and approximately 50kg weight give it a grounded, solid presence that works particularly well within gravel, stone and planting.
Basalt is naturally dark and substantial, with charcoal, black and earthy brown tones running through the stone.
The contrast between the polished upper surface and more rustic sides allows the same piece of basalt to display two very different textures.
Once wet, the darker tones intensify and the differences in surface texture become even more visible.
Because the feature is formed from natural basalt, exact diameter, shape, edge profile, texture and colour will vary. The dimensions given are therefore approximate rather than a promise of an identical manufactured form.
Moving water deepens the black and brown basalt tones while highlighting the contrast between the polished dish and more rugged natural sides.
The included LED adds light to the moving water, creating an additional focal point and allowing the feature to remain visually effective into the evening.
The low profile and irregular natural stone character make this Caldera particularly suitable for spaces where a tall architectural column would feel too formal.
It can sit amongst planting, within gravel, beside a terrace or as part of a broader arrangement of natural stone features.
Dark basalt also provides strong contrast against green foliage, pale gravel and lighter paving.
The supplied 66cm diameter heavy-duty pebble pool sits below the finished surface, allowing the natural stone and water effect to remain the visible focus.
Select a firm, level location with suitable access for the pump and lighting.
Prepare the opening required for the supplied 66cm diameter heavy-duty pebble pool.
Install the reservoir securely and ensure it sits level below the finished surface.
Position the supplied pump inside the reservoir and connect the water feed to the basalt feature.
Ensure the support is stable and appropriate for the approximately 50kg natural stone feature.
Carefully centre the feature and ensure the polished dished surface is correctly positioned.
Conceal the reservoir with decorative pebbles while retaining suitable access for maintenance.
Fill the reservoir and start the pump. Water bubbles into the polished dish before flowing back to the reservoir below.
Decorative pebbles are available separately, allowing the hidden reservoir to be finished to complement the basalt and surrounding garden.
The basalt shows softer charcoal, black and earthy brown tones, with the polished upper section visibly contrasting against the rougher sides.
The colours deepen considerably, bringing richer black and brown tones forward while water adds reflections to the polished dish and highlights the rugged exterior texture.
Explore the wider Caldera collection for alternative basalt finishes, stone forms, heights and water effects, from substantial natural pieces to tall architectural columns.
Our water feature specialists can help you compare polished, rustic and carved basalt designs, as well as advise on positioning, reservoir installation and the most suitable scale for your garden.
Visit our Manchester showroom by appointment or arrange a complimentary virtual consultation.

Water Features Under 30kg
Delivered directly to your door by DPD Local. You’ll receive a text or email with your estimated delivery time and options to redirect your parcel to a neighbour or safe place.

Heavy or Bulky Water Features
Delivered kerbside by a specialist pallet courier, with tracking provided after dispatch. Larger items may arrive in a protective wooden crate, which will require a suitable pry bar or similar tool to open.

14-Day Returns
Return your order within 14 days for a full refund, subject to our returns terms. Please inspect your order on arrival and store it somewhere dry and secure until installation.
Still have questions?
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