I've been playing with my skimmer. And thought i'd share what i've been up to.
First off - Deltec AP902. A fairly large skimmer by most peoples standards, 2 Ehiem needle wheel pumps. The skimmer is fed via a 25mm fitting which in my setup is fed directly from my overflow. It exhausts water from a 32mm fitting directly into the surface of my Refugium.
I am going to try a few different configurations:
The skimmer was cleaned on Sunday evening, the 2nd October. The neck assembly was cleaned out with hot water and the inner black flange was cleaned with paper towels.
10 days later, Tuesday evening the 11th October the skimmer looks like this:
I wanted to see how long it takes to fill the collection chamber. In this test I am skimming as 'wet' as I practically can. The water level is up the neck of the skimmer about equal with the level of the bottom of the collection cup. If I skimmed any wetter than this i'd be pulling tea coloured water and emptying the skimmer daily.
Lets have a look at the consistancy of the skimate:
This was wiped from the inside (the neck) of the skimmer. It was approximatly 3mm thick. Its waxy and about the consistancy of slightly dry toothpaste:
How much skimate:
So thats just over 2.6 litres in 10 days.
Its hard to show in the photos but the consistancy is dark, but not thick. maybee as dark as a black coffee. I would consider this 'wet' for a Deltec skimmer, although its probably darker than many other skimmers i've seen running (no disrespect to any other skimmer owners out there).
Thats it. Whats next?
Same experiment, but reducing the water flow through the skimmer. Currently its getting as much water as I can force through it, which I guesstimate to be approx 4,500 litres at hour. I've slowed it up by about half, so this time I will call it about 2000 litres per hour.
Why? I am hoping to learn something about dwell time effecting the performance of my skimmer. Even though the manifacturer has reccomendations, I belive that each tank is different, so I want to tweak the skimmer for my own systems, and my own requirements from the skimmer.
Stay tuned.
Pie