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01/29/2018, 12:46 PM | #1 |
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Join Date: Sep 2016
Posts: 21
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AWC with two small pumps vs Neptune DOS?
I'm in the planning stage of a 225g, ~300g total system going into a new house we are building. Water changes are something I'm trying to automate as much as possible of course.
I've read a lot about the Neptune DOS system a lot of people are using for Auto water changes. I have a couple concerns using DOS, the main one being how long the pumps have to run if you have a bigger system. The pumps would have to run for several hours a day just to change 2-3 gallons. That seems too long and I'd be concerned about wearing out the pumps and then inability to do a larger change if needed. Is there reason I couldn't hookup two separate Eheim 500gph pumps (or something similar), one in the sump, one in the NSW reservoir and program Apex to turn them on and off to change water? I know I'd have to figure out the calibration, how long to run each to get the needed gallons, need to turn off the ATO pump/sensor, etc, but is there a any reason you are aware of why this wouldn't work? |
02/15/2018, 10:17 AM | #2 |
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Join Date: Sep 2004
Location: Minnesota
Posts: 1,859
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you can do that, i had setup this way for friend's setup for 5+ years now without any issue.
but, big system water change is not very effective way to deal with nutrients, if nutrients isnt an issue, then water change is not doing much. big water change do more than small water change. i have a 400g system only do water change once awhile. i mean like 2-3 times a year maybe 50g/water change, mainly to siphon out crap build up in the tank.
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Dont let me know where u lived if u have a nice pair of clownfish in ur tank!^_^ Clown kidnaper^_^ Current Tank Info: 300DD, SM200/RD3,ATI 60-8X80+4X75, 2 Sea Sweep & 4X6105 & 6208 |
02/17/2018, 12:49 AM | #3 | |
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Join Date: Apr 2011
Location: France
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Quote:
DOS Flow Rate: Variable (0.1ml – 250ml/min). If I'm correct you need 15 minutes to change 1 gallon. |
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02/17/2018, 01:10 AM | #4 |
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Join Date: Jan 2006
Location: Westminster, CO
Posts: 17,289
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Pretty risky. A lot of variables that will be hard to predict.
Do you have a floor drain accessible?
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k. |
02/17/2018, 01:21 AM | #5 |
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Join Date: Nov 2016
Location: Northern California
Posts: 132
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The main problem I had with using dos for awc is even at not-so-high rates, it was really noisy for my living room. I don’t know where your tank is located.
The problem with your idea of using two pumps is that almost inevitably, the head pressures will be different and thus will pump water at different rates, potentially drastically different. So your salinity will drop or raise depending. You could try to have it down to a science and adjust your salinity of the newly mixed salt water accordingly, but practically this is a pain in the rear. Peristaltic pumps are much better for awc setups. Sent from my iPhone using Tapatalk |
02/17/2018, 01:23 AM | #6 | |
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Join Date: Sep 2003
Location: San Jose, CA
Posts: 6,499
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Quote:
If you use two pumps you can have apex disable ato then take out a set amount of water then fill with new water to set point then turn ato back on. Sent from my iPhone using Tapatalk Pro |
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02/17/2018, 08:19 AM | #7 | |
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Join Date: Nov 2016
Location: Northern California
Posts: 132
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Quote:
Ahh, like with optical sensors? Drain to this mark, and refill to this mark? That’s a cool idea. Sent from my iPhone using Tapatalk |
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02/17/2018, 10:46 AM | #8 |
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Location: San Jose, CA
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