Bog & size: Do I Do, or do I Don't
zone 4 Tucson, AZ Sonoran Desert
One site says
Bog: ... basically a basin ...equal to 5-10% of the pond volume. ...
Volume calculator MY POOL HOLDS ABOUT 30000 GALLONS
Bog filter to hold 5-10% of the pond volume --about 3000 gallons at once
Based on that, I need A ledge 12" deep and as wide and long as it needs to be
Bog Tank length 80'
Bog Tank width 5'
Bog Side water depth 1'
Cubic feet 400 = 14.8148 cubic yds of 3/8" gravel
Based on the abaove formula, I am assuming the bog filter for my 30'x 20' pool will be about 80Ã¯Â¿Â½x5Ã¯Â¿Â½x1Ã¯Â¿Â½
A=l x w 30 x 20 = 600 sqft
10% of 600=60 sqÃ¯Â¿Â½. 15% of 600=90sqÃ¯Â¿Â½
or 90 sq feet:
A ledge 12" deep and as wide and long as it needs to be
Bog Tank length 45Ã¯Â¿Â½
Bog Tank width 2
Bog Side water depth 1
Cubic feet 90 = cubic yds of 3/8" pea gravel
Gallons 672.3 gallons
On THIS formula, the bog would be 45 feet long, 2 feeet wide. That's a huge difference.
Both of these can't be correct.
HOWEVER, IÃ¯Â¿Â½m reading that if there are No fish, there's NO NEED to filter the water. That may be true is some areas/states. Is it true in Tucson? Thread name Pond stinks
Is my math correct?
Do I do a bog or not, and which size is correct, if I need to?
It would be wonderful if I could build it as I can, rather than having to feed this pool chlorine for several more months before transforming it to chemical free. What do you all think?