Semi automatic water changing - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 04-13-2020, 05:32 PM Thread Starter
Wannabe Guru
secuono's Avatar
PTrader: (31/97%)
Join Date: Nov 2009
Location: VA
Posts: 1,119
Semi automatic water changing

Hello, finally got the green light to put in holes and/or having tubes running along walls!

I'm wanting to make w/c for my 125 far easier. As in, I turn the knob, it drains, I turn another knob, it refills.

I currently have two sets of cpvc and clear tubing, plus some odd bits, to create hookover drains/refillers. They have knobs to turn flow on or off. I made a fixture that screws onto my faucet for refilling, I use a window to drain. I currently use only one to do both jobs.

I'm wanting to reuse these and place them at the rear on either end of the tank, one up high and the other down low.

I'm curious to know if it's worth it to have one side draining while the other side refills?

I don't believe that I'll be able to get it to work in a way that its always draining X amount while it refills an equal amount of water. The risk of flooding is too great, I've already flooded the livingroom twice and I was there the whole time. Lol.
The pipe is 1/2" and takes forever, it's been nearly 2 hours and its still refilling. I drain roughly 2/3rds, 80gals, at a time. I can add onto the tube to remove more water or use the shorter tube to remove less. The pipe's end automatically stops drainage.
I will not use a float valve for refilling and stopping automatically once full, the risk of flooding is just not worth it, even if it's a tiny chance.

So, I'm wondering how many gallons need to continuously flow in, while tank is draining, to equal a regular 80gal drain and refill. I know its constantly getting diluted, so even the new water will be draining, which means more needs to go in to reach the same levels. And that's what I need help figuring out.

I want to do it this way because then I don't need to unplug heaters and filters. Which I occasionally forget to unplug or to plug back in.

I currently match the water temperature through the faucet. With the system I'm wanting to install, I'll have a split in my output hose and both the hot and cold tap will connect to them with knobs to control how much hot water gets mixed in.

I am on well water and do not need to worry about treating the water.

My koi pond has recently been setup for this type of refilling and draining, except in the extra poor way. I have the garden hose dribbling water in and low end of pond has the liner lowered a gap to let it over flow.
Attached Thumbnails
Click image for larger version

Name:	20200413_132513_1586798726519.jpg
Views:	10
Size:	145.3 KB
ID:	896457  

♡ Forever Farms Babydoll Southdown Sheep ♡
secuono is offline  
Sponsored Links
post #2 of 3 (permalink) Old 04-13-2020, 11:55 PM
Planted Tank Enthusiast
Bandit1200's Avatar
PTrader: (4/100%)
Join Date: Dec 2010
Location: Houston, Texas
Posts: 819
Instead of a simple siphon tube to drain the water out, set up an overflow system. That way, it only drains out what you put in. Just make sure to size it adequately so that the outflow capacity is more than your inflow.
Bandit1200 is offline  
post #3 of 3 (permalink) Old 04-17-2020, 06:51 PM
Wannabe Guru
monkeyruler90's Avatar
PTrader: (70/100%)
Join Date: Apr 2008
Location: San Diego, Ca
Posts: 1,727
Send a message via AIM to monkeyruler90
I would probably start out slow and calculate how much water per hour it takes to average out a 50% water change a week

125~120 of water, doing a 50% water change a week would mean 60gallons

60 gallons/7 days~8.5 gallon per day ~ 1/3 gallon of water going into the tank per hour

see how the fish do with this type of flow and then you can adjust it

I agree with Bandit1200,
set up an overflow so the only thing you have to worry about is having water going in, not having to balance in and out

Fluval pimp #4 aka PIMP master!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
monkeyruler90 is online now  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome