The mesh should be 52 grade, and the concrete a minimum of 20 MpA, poured on a solid base of 50mm compacted crushed rock or packing sand.

When preparing the slab, box up formwork, with pegs or stakes every 500mm to avoid movement.

Want something to really set your job off, you can have a sheetmetal box formed and welded in one piece.  This can even be done with 100mm x 40mm C section purlin.  This is the ultimate in a tank installation project.

The most important adice I can give is, make sure your boxing or metal surround is set up dead level.  Nothing looks worse than a 1.8 or 2.0 metre tank out of level.

Its Ken here, and I am actually writing my first post.  I am still in the process of setting up our Plumbing Helpline Site. Over the next few days, I will be adding pages on each catagory of the Plumbing Industry.  Although the site is still work in progress, I would really appreciate any comments you may like to leave.  While I am in the process of building the site, still give me a call if I can help you out with any Plumbing problems or queries.