u/stocktankpoolhelp

Hi everyone, I bought a stock tank about 5 years ago and converted it into a pool and have always had one major issue with it - the bottom always feels gritty and uncomfortable to stand in. I've tried vacuuming, scrubbing, even very light power washing and can't seem to get the bottom clean and not gritty. I thought I'd try to get a poly stock tank to fit inside, but found out that my 8ft steel one is way less than 8ft, so the poly tank won't fit inside. I'm wondering if anyone has any suggestions? Thanks so much.