Andyjakematt

We just bought our first spa in a box last night. Set it up, filled it up with well water. We live in the middle of nowhere. This morning, the water is rusty colored. We knew this was going to happen. My question is, can Iron Out be used or will it destroy the material? It only holds 240 gallons of water, so the amount would be an extreme minimum. Any help and/or advice is greatly appreciated. Thank you all in advance.