I tought that lowering the flow would be a bad thing, but actually things got better in my tank after I changed the pump, perhaps I was overreacting with the flow, using a 90W pump on a 80 Gal tank. Things got better and for the last 3 months it's only using 25 W.
Perhaps I'm overreacting with the overflow itself too, I remember reading a post from Tom, regarding that his tanks degassed all CO2 in about an hour, doesn't happen to me. Actually it takes all night to increase PH by 0.8 units, never degasses all the CO2, neither faster. My Wet dry tower is sealed, but it ends up with gas build up during the day, and negative pressure during night. I think that water in Tom's drains trickles down the tube, allowing any gas build up to escape, because from what I see, that drains are not full siphon. Forgive me if I'm a bit intense with this matter, I just want to check my measurements are correct and Tom's tanks are perfect to compare, he's the "mythkiller".
I haven't seen any noticeable between having the wet-dry zone completly sealed and allowing a small area to let gas escape. To prevent any gas build up that causes backpressure in my overflow box, I inserted an air tubing to let the build up to escape, and measured PH via American Pinpoint Meter. The difference between those 2 scenarios was only a 0.07 PH drop aprox., higher in the airtight case of course. But affecting the water drop in the overflow caused a much significant difference. If this is correct, and if Tom doesn't have any build up in his wet-dry towers (He answered that before), any gas build up is escaping from his drains without causing too much trouble (Look at his tanks
).
I tried a very different range of flow from the return pumps, but even with the lowest flow and having a reduced agitation in the wet dry zone, I still have that gas build up, that's why I decided to leave the tubing.
Regards
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I tought that lowering the flow would be a bad thing, but actually things got better in my tank after I changed the pump, perhaps I was overreacting with the flow, using a 90W pump on a 80 Gal tank. Things got better and for the last 3 months it's only using 25 W.
Perhaps I'm overreacting with the overflow itself too, I remember reading a post from Tom, regarding that his tanks degassed all CO2 in about an hour, doesn't happen to me. Actually it takes all night to increase PH by 0.8 units, never degasses all the CO2, neither faster. My Wet dry tower is sealed, but it ends up with gas build up during the day, and negative pressure during night. I think that water in Tom's drains trickles down the tube, allowing any gas build up to escape, because from what I see, that drains are not full siphon. Forgive me if I'm a bit intense with this matter, I just want to check my measurements are correct and Tom's tanks are perfect to compare, he's the "mythkiller".
I haven't seen any noticeable between having the wet-dry zone completly sealed and allowing a small area to let gas escape. To prevent any gas build up that causes backpressure in my overflow box, I inserted an air tubing to let the build up to escape, and measured PH via American Pinpoint Meter. The difference between those 2 scenarios was only a 0.07 PH drop aprox., higher in the airtight case of course. But affecting the water drop in the overflow caused a much significant difference. If this is correct, and if Tom doesn't have any build up in his wet-dry towers (He answered that before), any gas build up is escaping from his drains without causing too much trouble (Look at his tanks
).
I tried a very different range of flow from the return pumps, but even with the lowest flow and having a reduced agitation in the wet dry zone, I still have that gas build up, that's why I decided to leave the tubing.
Regards