Swimming pools blog

Hi - we have no idea how long its been since the sand was replaced in
our pool filter so I scheduled a sand change. (we bought the house
1.5 years ago) They came out today and said that the filter is old
(80’s) and that there was no guarantee that the filter would reseal
correctly after putting new sand in. The price for them to replace
sand is approx $500, but a new filter and new sand is approx $1000
(with a warranty).
My gut tells me that we probably should put a new filter on. It is
the original filter and the pool was put in in the mid 80’s.
They are suggesting a SD-80 filter - does anyone have any experience
with this model? they said $574 plus about $200 for installation and
they recommended putting Zeobright (instead of sand).
I’m interested in opinions on this? Is this a good filter? Should I
be looking at another one? (they also quoted TA-60 for $650) - but he
said there wasn’t much difference in those two filters.

Help??? Who knows about filters??? This is an in-ground pool 20,000
gal.
Thanks for your help!!!
Pam (Washington State)