propper flow??????

i always hear that for proper flowin the tank you want to turn the water 10 times. now is that ph and sump pump or just ph? this is to get good circulation within my tank.


i have a 45 gallon tank with a 25 gallon sump,

return pump is a rio 2500
powerheads are two maxiet mp 900's

well what do you think????

thanks everyone