LAST time I had a pond was 15 yrs ago.. probably 1500 gallons,, it was
homemade fiberglass ( was interesting making this). we used a pool sand
filter, & had no problems with water etc..

but then,,,,, we never heard of ALL the stuff there seems to be you need to
check on, that I have read in the past week!! like bio filters, veggie
filters.... ph , acid,, etc etc.. ( I wonder how we ever had a pond
running!!??)

ok, now, I have searched some of your pages, & the web & am trying to find
some good simple examples of home made bio-filters, etc...
ALSO... I had read that pool sandfilters ,, aren't GOOD for ponds,, ( ok,
huh(?) , since we used it ok for years),, is there anything that we can put
inside in place of the sand??? that is CHEAP??? ( I called one place that
had some kind of material,, & it would cost over $400!!!).

TIA!!!