robfdny

My inground salt water pool is under 400 sq feet. The previous owner and the pool store near my house use the brand Bioguard. I know next to nothing about pools and was gonna continue to use the same product. i noticed a lot of online stores do not carry this brand. Whats the deal, is it a really good expensive brand & thats why many dont carry it ??? Are they all basically the same? Please any help, much appreciated, on this matter..... thankyou -Robert