Our New SILTBLOK 500 is an innovative and unique silt management product, designed and tested to filter out TSS (Total Suspended Solids), including silt to 30μm (0.03mm).
The SILTBLOK’s core technology is extremely eco friendly, using a 100% recycled thermoplastic material, formed into a macro porous/micro porous block or (BLOK). This BLOK is then strategically designed into the SILTBLOK 500 chamber, so that all of the flow from the connected surface areas pass through the BLOK itself.
The BLOK then separates/filters out the Silt /TSS within the flow, allowing only cleansed water to pass through its matrix. The SILT BLOK will not blind, deteriorate or corrode.
SILTBLOK SB500 is designed for housing or commercial developments, with a surface water run off of up to 1200m2 . Ideal for siting upstream of crate/cellular attenuation systems, ponds, swales and irrigation systems.
As detailed opposite the BLOK has a silt basket attached. The basket catches any silt and debris entering the unit and can be simply removed for emptying and cleaning. The basket capacity is 17.5kg, which is the average annual silt storage for around 4 average semi -detached properties.
SB500 models are not supplied with access covers.
Access Cover - 500ACC
- Inlet pipework – from 150mm & 225mm
- Outlet pipework – from 150mm & 225mm
Event mean concentration (EMC) refers to a flow-weighted average concentration in the whole process of a rainfall-runoff event, defined as the total pollution load mass divided by the total runoff volume
(Event Mean Concentration Values)
(Total Suspended Solids
(mg/l) or PPM)
|Commercial Areas||7.8 - 270|
|Car Parks||7.8 - 270|
High Density Residential
|55 - 1568|
Low Density Residential
|10 - 300|
|Urban Roads||11 - 5400|
|Highways||11 - 5400|
Approx. Weight of
BLOK & Basket
Approx. Weight of
BLOK & Basket
Some lead times may be extended due to consecutive bank holidays.
We will close for Christmas on 20th December at 4:30pm and re-open on 3rd January 2024 at 9:00am.
We're currently experiencing unprecedented demand, please bear with us while we work hard to fulfill your orders. If your query is related to an existing order please email in with your order number in the subject line. If you have a new residential enquiry please consult the online guides before calling as they may answer your question.
The delivery information page is divided into 1. Specific and 2. General delivery information below.1. Specific Delivery Information relating to product lines
- Small items dispatched daily with RM24 ~85% arriving next day
- Large items (UK made) typically 5 - 15 working days (Parcelforce/Tuffnells etc.)
- 1,000 litre compact underground rainwater tank
- Prestige Greco Roman Terracotta Style Vase Planter - Washed Terracotta
- SAR 40 Stormwater Pumping Station
- Green Roof sedum tray - pre planted option
- Powertank Compact 125l
We're a Manchester based company and ship to the UK at our standard rates. Please get in touch requesting the delivery surcharge value if you are based in the Highlands or a UK island.
We no longer support ordering from the EU and Northern Ireland through the website. We can support ad hoc orders with limited liability.
Our design and Prestige range is available in the Netherlands, Ireland, Belgium, France, Germany, direct or through our distributors.
Stock items will be dispatched on the day of order, if ordered before 1pm.
Letters are sent 1st class.
Parcels <2kg are shipped with Royal Mail 24 Tracked with the following target delivery times.
Guaranteed delivery can be arranged by advance agreement. This agreement is back to back with the courier and we will not be liable for any delays as per our terms.
A loss/replacement can only be pursued in line with the target delivery times of the courier or once the courier accept loss.
Bulky items (and pallet deliveries) are dispatched within 2-15 working days. We will request a contact number if this has not been provided at checkout.
Some items are made to order (bespoke) and details are given on the listing for dispatch times. If for any reason we anticipate a delay on our normal dispatch time we will contact you to let you know.
Occasionally there are delays. We shall not be liable for any direct or indirect losses, costs, damages or expenses incurred by you or any other person for any delays in delivery.
Missed deliveries where attempted delivery has been made usually result in re-deliveries the following day. The customer is responsible for organising re deliveries by contacting the courier direct.
Parcels/deliveries can only be "left out" if the delivering company allows that option. Parcelforce, for example, do not allow a parcel to be "left out".
We are an environment centric business and as such we try to minimise our waste. Our packaging is usually recycled and/or recyclable and we make efficient use of packaging to minimise wastage.
Covid delivery updates between 12.3.20 and 11.1.21 21 have been archived here.