Description
Sand (silica) in its different forms (sand, silex, gravel) is the oldest natural available granular filtration media. Even today, the use of sand remains popular for the treatment of municipal water in very big open gravity filters, in swimming pool filters and in pressurized filters for the treatment of ground water.
In a lot of groundwater applications the use of sand has been replaced with other granular filtration offering more benefits (faster flow rate, better quality of filtrate, lower in weight, etc.)
Sand is present in nature all over the world, washed and sieved. It exists in different grades that vary from one supplier to another. It is used for the removal of suspended solids, but can also be used to filter of oxidized iron or manganese.
A pressurized sand filter always contains different layers of sand, going from relatively fine sand on top to coarse gravel as a support layer. In between the use of 2 more particle sizes is common.
thomas –
Nicepebbles but need washing as lots of sand mixed in
Guest –
Look great in the front garden. Highly recommended.
Becky –
Fantastic pebbles especially for the price They are lovely looking especially in the rain.
Lisa –
Great natural colour pebblesFabulous price for this item
Amy –
Worked amazing where we wanted for a little Zen garden area for my little boy with all thats going on at the moment
andy –
When cleaned with water, they are a really attractive stone and good value
Guest –
Really nice pebbles, look great in situ. Pebbles of different sizes makes it easy to fill space with.
Guest –
Excellent value. Bags are good to reuse for rubble.
Guest –
Used to top a flower bed. Absolutely perfect looks great
Kye –
Ideal felt for re covering my shed roof. Great price as well. Highly recommend.