hi
dont know about ""filter start"" but i used ""safe water"" and apparantly that contains bacteria as it says on the tin !!!!!! - but i still had to cycle -whether it sped up the process not sure but my cycle finished in 23 days!!!!- using fish too
other one i have READ about is called bio-spira dont know if it's avail in uk though?!?!
as the bacteria we need in the tank needs oxygen and ammonia and if a sealed bottle is on the shelf for however long surely they pass the xpiry date or shelf!!
my penny's worth !!