Then is t ok if i wanted a 5 turnover rate for my 40gallon and use multiple filters which add up to 200g/hr?
I remember that thread. There was a problem in the testing, but I don't remember what it was. And I don't have the brain power right now to go back and figure it out.Jc1119;4789129; said:So, Chompers, since you are the man when it comes to the math involved in tank-pump sizing help me understand this.....
the tank i want is a glasscages 300 gallon with what appears to be (4) 1 1/2" bulkheads--2 per overflow box. The pump I want is a reeflo super dart gold rated for about 2700-2900gph@6-7 feet head. While discussing the use of the second hole in each overflow box with some of the other members I was introduced to the Herbie style overflow--basically a secondary drain design that reduces the drain splashing volume in the sump. Great idea. Plumb the first drain hole in each box normally and set up the second hole in each Herbie style......but
while researching i ran across this
http://www.wetwebmedia.com/BulkheadFloRateArt.htm
I was concerned about the gph drain flow through 1 1/2" pvc which isnt a problem, but the 1 1/2" bulkhead is. According to the tests the bulkheads will only allow 975 gph to the sump. Times two is 1950 gph which is about 1000gph short.
Since i really want to turn the tank around 10x an hour should I have glasscages cut the primaries 2" to be safe? I could leave the secondary holes 1 1/2" and be good according to the math but i feel i might be missing something (again!!!)
I only ask because this info did not come from some chart, it was an actual test on various bulkheads and I tend to trust real testing. Thanks in advance!
By doing this, a person is balancing flows with a false sense of security.
That's a good concept. While MFK was in an information vacuum during its infancy (if it could ever be called that), we slowly evolved to the same concept. In the early days, several of us used ball valves on the end of the plumbing to the sump to "tune" the pipe to the flow of the pump. When the 'in' and 'out' were matched, the system no longer ingested air. When the pipe purged the air inside, the flow would pick up and then it would ingest air again. You would have to keep adjusting it until there was a happy medium. (There was also a problem with the water levels bouncing.)Jc1119;4789129; said:the Herbie style overflow
freshfishla;4854234; said:hey I have an oceanic 175 gallon aquarium with dual overflows. Since I have dual overflows does that mean I should look for twice the power. Also for an African cichlid tank what is the preferred turnover rate. I appreciate any advice.