Joined: Aug 19, 2005 Posts: 4895 Location: Mathura, UP
Posted: Wed Nov 15, 2006 4:09 pm Post subject: Re: identifying river sand?
It is the size of sand particles whichis more important, if they are between 2-3 mm, they aer okay.
Normally particles of this size are sieved out and not used in construction, most of the times you can get it for free.
Take some Cleaning acid and put some drops in sand, it should not fizzle.
Just wash it very properly, lots of time by water, do not use soap etc.
Posted: Wed Nov 15, 2006 4:39 pm Post subject: Re: identifying river sand?
Without doing the acid test, is it safe to assume that sand next to a construction site will always be river sand?
The discarded sand that I am talking about still appeared a little too fine to me, esp for aquarium use. But I know what you talking about. I have seen them seive that sand. I mean to talk with the construction workers and ask them to keep aside the coarse granules.
One other thing. My house is located on a rocky terrain which I think is very rich in laterite. If anyone has been to Goa, they will know what I am talking about. I talked with a colleague of mine who is a chemist and has analysed that rock in particular. I asked him if adding that rock in water will cause increase in water hardness. He replied that it will not, if anything it will make it lighter. Assuming he is correct, can I just use coarse granules of this rock as the entire substrate? Maybe mixed with a bit of river sand.
The excavator at the construction site is constantly digging its way through the rock. You can get really rich red brown pieces of that rock in all kinds of sizes.
Joined: Nov 10, 2006 Posts: 990 Location: Madras-Chennai
Posted: Wed Nov 15, 2006 6:51 pm Post subject: Re: identifying river sand?
river sand is really fine and can be easily disturbed by bootom dwellers and other big fish or excessive flow of water currents near the bottom.the left over sand from construction sites is really good as a substrate but u have a wash a lot before u put'em in the tank as they cloud the water .but if u have a good internal filter then don't worry too much because the water will clear over a day or two .but i rather say tht wash extremely well b4 putting them !they are excellent and free alternatives than other substrates .u can add a thin layer of red sand over a layer thin layer of the sand being used as substrate and cover it with a thicker layer of the subtrate so tht the red sand is wedged bwtn the two layers.
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