Ok, Im back...
I had to sell somethings at work today to justify my internet time... and then come home and feed the women, and ire them out, and super dad is still truckin along for a bit longer to help jessica some more...
I must admit, I really don't have anything new to add, Just examples. You all hit EXACTLY the same principal items I would have touched on and I didn't klack any keys getting it done...
Yes, I use the Check valve system, I use a HIGH QUALITY check valve proly the same clear one Scooter uses. It's pvc, and glues easily. Seen in this link.
http://www.marinedepot.com/md_viewItem.asp?idproduct=FT8977
I just had to buy another one... seems the fellow I sold the last one to without getting money from has it hopelessly glued into a mess with no water running thru it.
I have tested it several/many times. works great. But Alas, I to am a doubting thomas on some items. that's why I used the second method as well. I drilled a 1/8th inch hole in the Loc-line (the black snakey stuff) threaded connector facing upward.... yes, up.
INSERT IGNORE IGNORE LINK:
http://www.modularhose.com/
I love the stuff, even used it on the led project... any-hew. the returns on my system are about 5" below the surface. (see point 3) the 1/8th inch hole sprays upward, but is buffered by 4" of water over it... I clear this hole FREQUENTLY as any debris can impede it's/their performance. this means every 60-90 days I use an old twist drill bit and my fingers to test it. it's not been blocked yet.
Point 3. Have you ever noticed how huch your tank goes up when you add 1 gallon of water? Or perhaps 5. or in the case of my 300, a 45 gallon trash bucket... but that's not the point here... in a 75 gallon tank, 1 gallon of water spread out to cover about 1/2"to 3/4" of water height. now, the check valve fails.... what's EXACTLY gonna happen... ? The tanks gonna drain to the anti-siphon hole... 4" down... about 5 and 1/2 gallons of water. Did you remember the original picture of my filter?
<a href="http://photobucket.com/" target="_blank"><img src="http://i28.photobucket.com/albums/c205/jmkarcz/DCP_8004.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a>
notce that bottom ALL Glass 15 gallon tank... I got from Spike's boss Scott. When the system shut off, and I rigged the valve..(not gonna explain that one here, call if you need help) I filled that 15 gallon tank to the brim. BUT I did not spill 1 drop. that's why I made this change...
<a href="http://photobucket.com/" target="_blank"><img src="http://i28.photobucket.com/albums/c205/jmkarcz/New27gallonsumpforreef_0053.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a>
a 27 gallon acrylic sump from Glasscages.com I had it retrofitted and installed in a jiffy.
The point is, and here's a doosie... now I have room for an additional 15 gallons of water. but that's not the Paul Harvey here. The rest of the story is, and everyone will tell you, that your ENTIRE system will be made or broke on about 4 gallons of water or less. (generally speaking. Here's why... ask anyone on this board... anyone, to go to their tank, turn off their auto top off, and siphon 5 gallons of water out without turning off their pump. The result will be the same... the pumps would either spit bubbles, or nearly run dry. Why is this...? it's called Water in play boys and girls... it's the measure of water that exits taller than your baffels, overflows, pipes, waiting to go down the drain... I call it "magic time" when I start a new system. My 145 gallon reef (with filter) balances on about 2.3 gallons of water. If I loose that water, it ceases to run. Theres not enough water to pump into the tank, to cause an overflow, to run the water thru the filter maze, to get to the pump.
The magical time I was refering to, is that first time you add water to a new system. The time where it slowly fills the overflow to the point where it flows to the filter, then to the filter, then the first baffel, and then the second, and then any holding chambers.... BUT NOT the final chamber where the last chamber housed the bump intake. I slowly add till you determine the lowest minimal water line for the pump, this is the danger line. I add a gallon of so, this is the low and add line, I add an additional bit, gallon or 2 and this is the optimum running line.
What does this mean for Jessica...? If her returns were about 4" below the water line, (on a 46 gallon tank mind you) she lost 5 gallons of water into a 20 gallon sump....? It won be a problem so long as she dose not have more that X + Y + Z is not greater than 20 gallons....
where X is water in sump
where Y is the water in play
where Z is the maximum amout that can drain from the tank.
Stay tuned...
J