That's about the going price in my area for filter sand. If you figure that the sand is good for 10 years (and many will say it lasts longer than that) it's only $6 a year.

BTW (by the way) I work with Deaf kids and they don't necessarily use the same TLAs (three letter acronyms, which often have more than three letters!) when they text. The ones whose native language is ASL tend to use ones that are a bit different than the HOH (Hard of hearing) or those that had oral instruction in English.