Clear green, I didn't understand that, I thought it was cloudy and green - sorry. I'd bet it's copper and that the copper is from the Krystal Clear. Most Intex type pools get drained at least annually, your pool has had the opportunity to accumulate copper. I'd also guess that with a CYA of less than 30, the SWCG (and copper ionizer) was working double shifts to keep the pool clear.

Refill is not the only option, I'd defer regarding metals removal but there are ways to manage metal in the water. CuLater packets also seem to help actually remove the metal from the water, you don't have a skimmer that would work but you can hang 'em in the pool like your CYA sock. Please read the stickies in the metals forum to get familiar with the process.

If you have no blonde (or color treated) haired swimmers and you can live with the risk of greenish fingernails (or green hair for that matter) you can swim - as long as there's adequate chlorine and the water's clear.

This shouldn't change your plans regarding a big pool. You won't be able to fill it from your well - you'll need water trucked in. I'm pretty sure that at this point no one will be able to sell you an ionizer or mineral system of any kind and that you'll never ever ever use a copper based algaecide.

I never knew how hard it is to describe shades of green. I felt pretty clever with "Statue of Liberty green"