Hi Bad, How bout them Jazz? I sure hope the Suns win a couple more so we can play you guys.

I think the overall consensus is you are better off without the end blocks. Brace blocks are a must have.

Dirt is fine for all of your backfill needs. They just want to make sure it will pack firm and not settle under the weight of the water.

I would use your foam first with your preformed coving over that. Sand is not needed and would just mess things up.

I would give the fumes from the triox as much time as possible to disperse before putting a liner over it. A couple of days would be ideal.

Best of luck, Dennis