Tube settler media or inclined plate media?

Both are lamella settlers. Both are quoted in the same tenders. The difference that decides the specification is not the settling theory - it is how each one behaves when the sludge is difficult and the crew has to clean it.

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Ask which fits your basin Specification sheet (PDF)

The same physics, a different geometry

Both products work by the same principle: shorten the distance a particle has to fall before it reaches a surface, and the settling area available in a fixed basin volume increases several-fold. In our published figures the settling media gives a 3–5× capacity increase over a plain horizontal-flow basin, and 2–3× in a deep clarifier converted from inclined plates. That is a property of the principle, not of the product, so it does not decide the choice.

What differs is the shape of the channel the water travels through.

Tube settler media	Honeycomb cells of Φ25–90 mm, welded into modules of 1000 × 500 × 1000 mm. Each cell is a closed hexagonal duct
Inclined plate media	Corrugated sheets of Φ35/50/80 mm equivalent spacing, stacked into the same 1000 × 500 × 1000 mm module envelope
Both	Installed at 60° to the horizontal, stacked 4–5 m deep, loaded at 3–5 t/m²·h with a channel velocity of 2.5–3.0 mm/s
Specific surface / porosity	62–236 m²/m³ and 93–97 % across the published range, for both product families

Read that last row again: on the numbers that design software uses, the two families overlap completely. If a supplier is winning a tender on specific surface alone, you are comparing a large cell against a small cell, not a tube against a plate.

Where the geometry actually shows up

Sludge that does not slide. A hexagonal cell is closed on six sides, so a sticky or fibrous sludge has to travel down a duct. A plate pack is open at the sides, which means the same sludge has a shorter path out and less wall to cling to. For chemically conditioned sludge, or for a plant dosing polymer badly, the plate pack is the more forgiving of the two.

Solids that blind the surface. In the other direction, a closed cell resists being pushed sideways by a surge of flow. Where the plant sees periodic high-solids events - mine water, storm flows, digester overflow - the duct keeps the flow pattern intact and the pack recovers faster once the event passes.

Cleaning access. Plate packs can usually be lifted out and hosed sheet by sheet. Tube modules are welded blocks: they can be taken out whole, but individual cells cannot be reached. If the maintenance plan is annual manual cleaning with limited crane access, this is the deciding factor and it has nothing to do with performance.

Structure and support. The plate pack needs a support grid at closer centres because it is a stack of sheets rather than a rigid block. On a retrofit into an existing clarifier with a fixed support beam layout, the tube module often needs less steelwork - which is a real cost line even though the media itself may be priced similarly.

Material, and why it moves the price more than the shape

Both products are supplied in polypropylene and in ethylene-propylene copolymer, with stainless steel and FRP available where the specification calls for them. The published service life is 3–4 years for PP and 8–10 years for the co-polymer grades. That range - more than double - is the largest single variable in the quotation, larger than the difference between a tube and a plate.

Prices are quoted on request against material, cell size, quantity and destination port. We do not publish a price list, because a polypropylene module and a co-polymer module of the same nominal size are not the same product.

Frequently asked

Is a tube settler better than an inclined plate settler?

Neither is better in general. They share the same settling principle, the same 60 degree installation angle, the same 3-5 t/m2h loading band and the same 62-236 m2/m3 specific surface range. Tube settler media suits sludge that must not be pushed sideways and basins with fixed support beams; inclined plate media suits sticky or fibrous sludge and plants that clean their packs by hand.

Can I mix tube modules and plate packs in one basin?

Physically yes, but do not. The two have different support requirements and different cleaning routines, and mixing them makes both harder to service. Choose one geometry per basin.

What cell size should I specify?

Start from the solids: coarse, high-load or abrasive solids suit the larger cells (Ф50-90 mm), while the finer cells (Ф25-35 mm) give more surface area for slow-settling floc in low-solids water. Sizing the cell for the worst hour rather than the average is the single most useful rule for a basin with variable load.

Do both products give the same capacity increase?

Our published figures apply to the media range as a whole: 3-5 times the capacity of a horizontal-flow basin, and 2-3 times when converting a deep clarifier from inclined plates. The difference between products comes from the cell size you choose, not from the shape of the channel.