Set the sump on what?

What is that material I see people setting their sump on under the tank to balance the load, and where do you buy it? Looks like a dense piece of foam insulation.
 
I use foam core board. You can get it from Asel Art or Michaels, it is about a 1/4" thick. Others use the Cornings foam wall insulation board that you can buy at Home Depot, it is about an inch thick.
 
The stuff at Home Depot is pink, comes in 3/4" or 1" thick. The stuff at Lowes is blue, and comes in 3/4". It's about $11 a sheet, 4'x8'.
 
Thanks guys I got the pink stuff, wish I would have known about the blue before I purchased. Thats my life story. If anyone in Rowlett needs some pink let me know or I am going to throw it away.
 
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