Need advice for erasing disk/partition

Hey everyone,
I currently have a Mac Pro that is partitioned with both Lion and Snow Leopard. I'm trying to un-partition the computer and wipe it clean - thinking of updating to Mountain Lion but would like to stay with Snow Leopard for now if possible.
I erased the Lion partition by using Disk Utility but now I'm wondering what the best way to clean the computer is.
When I go into Disk Utility and go to "Erase" it won't let me select Snow Leopard. I went to Disk Utility Help and it says "To erase your computer’s startup disk, you must start up from another disk, such as a Mac OS X installation disc."
This means that I need a hard copy of an OS installation disc before I can erase/clean Snow Leopard? Is it possible to buy the disc from Apple or are the OS systems only available for download through the app store now? Are they only selling Mountain Lion?
Any tips or advice here is greatly appreciated!
Thanks!
~ Hugo

What is wrong with your 10.6 Snow leopard installation that it needs to be "cleaned"? Macs generally do not need to be cleaned, as they do not accumulate filth.
How did you get 10.6 snow Leopard onto your computer in the first place?
What model mac Pro ?

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Message was edited by: BDAqua

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Powered by C++

> what was the guidance?
1. Research other software that does similar things (not just exactly the same) as you need. If you like something in their solutions, copy it :)
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Spurious Permissions Errors In 10.3.x
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ali b

Need advice for erasing disk/partition

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