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I believe what you have are two 700 overflows, so a total of 1400 max GPH. Herbie overflow styles do not apply with glass-hole kits and both drains will be active at all times. If you want, you can run 700 to the system, and if for some reason one return is blocked the other will be able to...
I would say I'm pretty happy with my phosphate reduction. I added some rock to my tank that wasn't fully cured yet. This was my fault, I didn't want a bucket of rocks sitting on the floor of my kitchen. I had a huge algae outbreak, and decided to try the bio pellet reactor that I intended for my...
I got the "lube" option when I ordered my glass holes kit and it came with this stuff called magic lube. Not sure if and where you can get it locally. I'll have to look around HD next time I'm there.
http://www.waterwaydirect.com/maluluandse.html
Define "drops", like 3 drops from the bottle or from an eye dropper? I've never heard of anyone dosing in drops before. Even on my 8 gallon Biocube I dose 5 mL a day of Kent tech A/B two part. 5 ml = a LOT of drops.
Also, testing immediately after dosing will give you a false reading.
If it is just water getting past the standpipe where it sits in the bulkhead connection(inside the tank), that is nothing to worry about. If you want, some silicone plumbers lube will take care of that.
Still don't follow where it is leaking from but as long as it's not leaking outside the tank around the gasket you will be ok.
At this point, I would toss that overly complex bulkhead and get a standard $5 black bulkhead and call it a day! :D
Plus the maintenance costs, they are cutting programs and teachers state wide as it is. I think it would be a tough sell to get a school to take it and maintain it at the level it needs to be kept, especially on a thinner than a shoe string budget.
The one side of the housing unscrews to get the membrane out (left side in that Pic). Do you have the wrench to get the other filters out? I'll check how you have it all connected tomorrow.