De or het zandpiste?

The correct Dutch article is:

de zandpiste

Rule Words ending in -te: usually de. See the rule

How to use zandpiste

the zandpistede zandpiste
this zandpistedeze zandpiste
that zandpistedie zandpiste
our zandpisteonze zandpiste
your zandpistejouw zandpiste
every zandpisteelke zandpiste
which zandpiste?welke zandpiste?
a big zandpiste / the big zandpisteeen grote zandpiste, de grote zandpiste