Day 95
Thanks for all the support.
Today I changed out the refugium which actually took a few days to prepare.
In order to get the correct water height for the skimmer I needed to build a platform. Reading the Tunze forums and getting advise from others who reply on this thread, I built a platform that would put the water level at 10".
Tunze states the skimmer is designed to work in low level and higher level water areas. The external tube maintains the proper level of 11" within the skimmer when water levels are somewhat lower. Using the tube allows for 100% efficiency. You can also remove the tube but you need to get the water level close to but not higher than the 11" mark on the skimmer. Removing the tube causes the skimmer to recirculate 20% of the water but Tunze claims the reduced efficiency is minimal.
With that said I decided to build the platform to put the water level at 10". This gives me the option of removing the tube if it gets to crowded in the skimmer area in the future.
I used a piece of the second refugium and some PVC pipe with super glue gel. Finally found some use for that second fuge.
One of the other projects was to replace the gravity fed auto topoff with the Tunze Osmolator which uses a sensor to detect the water level. It also combines a float switch to shut off the pump just in case the sensor fails. When the water level drops it turns on the pump in the reservoir which pumps for a limited time (another safety feature). I may also hook this up to the AC Jr. for even more protection.
The sensor can be hooked on either a horizontal or vertical plain. It also comes with two brackets but I decided to use one.
I used the other support to hook up the return hose to the tank. To keep from siphoning out water from the reservoir the outlet has to be higher than the highest water level in the reservior. Also you need to make sure the hose does not get in the tank or a siphon can occur the other way. An inline check valve can resolve this.
The reservoir only needed minor modifications to allow the hose and pump power line to exit the container. The bottom bulkhead has been blocked off but I am not quite happy with it. I had a minor flood when filling the reservoir to test the auto topoff. The tube came out of the shutoff valve. This happened a while back when the shutoff valve was being used on the fuge. Since this was the same shutoff valve I put a new one on.
One note: The Tunze provided hose is not standard size tubing. I was lucky they provided a hose long enough to reach from the reservoir to the tank. I estimate it's about 8'.