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I don't even use my siphon set anymore, I prefer to just scoop the water out with a half gallon pitcher then dump it into 6 gallon buckets. Scooping allows me to catch all the floaters and plant clippings, is quicker than the siphon, and I never have to taste tank water. However with a very large 100+ gallon tank I'd likely go another route for water changes.
 

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Wait so you want to siphon out old water?

I bought a clear hose from Homedepot, they sell it by the foot. To start the siphon what i do is take the hose to the sink & fill it with water, then hold both ends with my thumb, walk towards the main tank & drain the water into a bucket. for filling I also do the same method, but keep in mind when filling main bucket has to be higher than tank
 

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Just get a long hose to go outside, take a big inhale through it to get the siphon going, and wait for the water to come out. Just don't inhale too hard, or else you'll get some foul aquarium water in your mouth/lungs haha
 

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No need to suck on the hose to get the siphon going. Stick a couple of feet of hose into the tank, then plug the other end with your thumb. Pull enough hose out of the tank so that the water in the hose is below the water in the tank, and take your thumb off.
 

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I use a 50ft garden hose with a small fountain pump on it. I drop it into my tank pump the water into my bathtub. Then unplug the pump to stop sucking then go to the bathroom screw the other end to my faucet and fill the tank back up through the pump.
 

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25 or 50ft of 1' ID tubing
Pump
Ball Valve
Brute Trash can (on wheels) for clean freshwater
waste water down drain or wherever
 

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I made one, very simple and very cheap.
It works by holding water in the tube when you close it after refilling from the same hose.
Drew this up of mine. The ball valve should be below the base of the tank so there will be enough water in the pipe to pull water out next time it's opened.
If you want the intake to be very deep in the tank, the ball valve will need to be even lower, at least 8in.
I have mine half way in so it will drain by itself for a 50% water change. My hose is the right diameter that I can put it into my kitchen faucet to refill.
 

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The U shaped PVC garden hose thingy works great, I use those plastic strainers used for prefilters on wet/dry filter(come in 1/2, 3/4" or 1" sizes and make a T, so the water des not direct straight down.

This way the same hose used to drain, is also used to fill.
The U hook stays put till you are done draining and filling.
Unhook the other end to drain down the bathtub or outside to landscape plants/grass etc, and then once drained, take that other end and connect ot the shower head(you get a plastic adapter) adjust the water temp, and refill, add dechlor to the tank you are refilling directly when you start the refill.
 

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I have one more suck free way to siphon. Dip the siphon head (the flared part) into the tank and fill it with water. Keeping it vertical to hold water, pull it out of the tank while covering the other end of the tube with your thumb. Keeping your hands about level outside of the tank, you'll have one hand holding the siphon head vertically and full of water, the other hand equal level with thumb over tube. Slowly remove your thumb, allowing the water pressure to fill the tube with water and forcing the air out where your thumb was. Watch closely and start to re-cover the tube once it is near full. But be careful because it can go fast. The tube doesn't have to be full all the way to your thumb, just within a foot or so.

Once the tube is full of water, dip the siphon head back into the water keeping it vertical the whole time. Before inverting it allow it to fill back up with water. Once it's full simply keep it under water and as soon as you release your thumb from the other end the water will begin to flow. It sounds more complicated than it is.
 

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The U shaped PVC garden hose thingy works great, I use those plastic strainers used for prefilters on wet/dry filter(come in 1/2, 3/4" or 1" sizes and make a T, so the water des not direct straight down.

This way the same hose used to drain, is also used to fill.
The U hook stays put till you are done draining and filling.
Unhook the other end to drain down the bathtub or outside to landscape plants/grass etc, and then once drained, take that other end and connect ot the shower head(you get a plastic adapter) adjust the water temp, and refill, add dechlor to the tank you are refilling directly when you start the refill.
I understand how to prime a regular gravel vac with water in the tube to get the siphon going, but I don't get how you get a long hose pipe going without have to suck the water through. There is no way I'd do that. lol
 

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I understand how to prime a regular gravel vac with water in the tube to get the siphon going, but I don't get how you get a long hose pipe going without have to suck the water through. There is no way I'd do that. lol
The water in the hose only has to be below the level of water for gravity to make the siphon work not out of the end of the hose.

"Magnets how do they work? We can improve it with the Power of Steam!"
 

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Not that you would want to go out and buy one just for this purpose, but a power head can be a very useful tool during a WC. I found vinyl tubing to fit over the output of the power head and simply pumped water out.

I only did this because I had an extra laying around not being used. Like I already said, this is not something that you would buy specifically for WC purposes.
 

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I connect my drain hose to a hose bib outside, with the other end laying on the deck. I run water until water comes out the other end. Then turn off the water, put the tank end in the tank, and turn on the water briefy until no more big air bubbles show up in the tank. Shut off the hose bib, unscrew the hose from it and poke it where I want the water to drain (into plantings). The hose is full of wate so the siphon is fully established. When enough water drains out, I screw the hose back on the hose bib, and turn on the water to fill the tank. When the tank is full I shut off the hose bib, pull the hose end out of the tank, and holding it high I carry it ourdoors. Disconnect the hose from the hose bib and roll up the hose as the water flow out of the hose.
 
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