Have purchased a home with an inground pool equipped with a Triton sand
filter. The filter has functioned well for several years and been
backwashed, as required.

My question is whether the sand in these filters needs occasional
additional quantities due to backwashing losses and/or whether the sand
needs to be changed entirely on some schedule. The user manual for
this equipment seems quite rudimentary and mentions nothing about
maintaining/changing the sand, other than backwashing. Also, I can
find no web site for the manufacturer, just a blizzard of store sites
selling the equipment.

Can anyone out there provide some guidance? and a link to a
manufacturer web site?

Thanks.