Hi all my wife wants to install a pool in our back yard ,im not to crazy about pools as I lost a family member to water accident .So she convinced me to install a sixteen foot round blow up rim this year an see how it goes from there as I am from europe an don't know nothing about pools what kind of base do I have to put under it,I thought maybe sand that kids use in a sand box but I don't know can you help me please as she brought it at a local store it holds 3500 gallons and my kids would like it up if all goes well we will install a peremeant one next year