there should be no need to make adjustments , heres how it works
your primary drain is your workhorse , this is going to be a full syphon. basically open your gatevalve all the way and then slowly close it untill water level is rising not falling. once the water height is about 2" above your standpipe fine tune the gatevalve closed so it matches your return, now you have a bubble free super quiet drain,fine tuning may take a little bit.
the height of the primary standpipe sets the water level in the box , shoot for about 1/2-1/3 of the overflow box so there no noise of rushing water.
no durso is needed imo and its easier to fine tune the water level looking directly at the top of the standppe, we designed your tank in a way that no fish or snails are getting in unless they are under 1/4" in size.
the water in the box wont have a lot of flow as its all syphon and it collects ditrius so be sure to clean in reguarily.
for the emergency set it at water height , i like to keep this dry untill emergencies arise, never restrict your emergency or use it for more than a trickle.
the weir is 1 1/2" deep from the eurobrace this allows for a 1" water line in the tank.
be sure to test it before walking away , test the emergency and i use marks to fine tune my primary, if after a few hours it goes down slightly ill just barely tune it....after a while the sweet spot is found.
cheers
denny
concept aquatics
|