Neptune DOS question

lennyd19 · 04/04/2016, 09:31 AM

I read in the CRM that the DOS can operate with 24' head pressure with no lose. My mixing and holding station is 12-15 vertical feet and 25 horizontal feet will the dose be able to pull water to my sump for an automatic water change?

Breadman03 · 04/04/2016, 09:52 AM

I wouldn't expect an issue. Granted, mine are on the same level, but I have an AWC from new to DT, DT to QT, then QT to waste. The longest run is about 25 feet with about 6 feet of vertical head and has no issue. When I calibrated it from new, it pumped exactly 40ml, the intended calibration volume.

lennyd19 · 04/04/2016, 10:17 AM

Have you seen an positive or negative effect with smaller water changes and do you do simultaneously pull water from tank and put new in?

Tarawa · 04/04/2016, 09:08 PM

I also run a DOS for auto water changes, the line runs about 30' with about 9' total vertical. I test the calibration every two months, and they are spot on still. Probably will be until the silicone tubing inside the rollers fails. I let it pull and add simultaneously, pulls the water out in the first section of the sump, and adds to the last/return section.

Breadman03 · 04/04/2016, 09:35 PM

I do it simultaneously. As far as negative effects, I don't see any, but a period of neglect previous to having the AWC set up resulted in a massive buildup of nutrients that I'm fighting.

04/04/2016, 09:31 AM	#1
lennyd19 Registered Member Join Date: Feb 2005 Location: ny Posts: 334	Neptune DOS question I read in the CRM that the DOS can operate with 24' head pressure with no lose. My mixing and holding station is 12-15 vertical feet and 25 horizontal feet will the dose be able to pull water to my sump for an automatic water change?

04/04/2016, 09:52 AM	#2
Breadman03 New Old School Join Date: Feb 2012 Location: Luzerne County, PA Posts: 3,293	I wouldn't expect an issue. Granted, mine are on the same level, but I have an AWC from new to DT, DT to QT, then QT to waste. The longest run is about 25 feet with about 6 feet of vertical head and has no issue. When I calibrated it from new, it pumped exactly 40ml, the intended calibration volume.

04/04/2016, 10:17 AM	#3
lennyd19 Registered Member Join Date: Feb 2005 Location: ny Posts: 334	Have you seen an positive or negative effect with smaller water changes and do you do simultaneously pull water from tank and put new in?

04/04/2016, 09:08 PM	#4
Tarawa Registered Member Join Date: Feb 2014 Posts: 245	I also run a DOS for auto water changes, the line runs about 30' with about 9' total vertical. I test the calibration every two months, and they are spot on still. Probably will be until the silicone tubing inside the rollers fails. I let it pull and add simultaneously, pulls the water out in the first section of the sump, and adds to the last/return section.

04/04/2016, 09:35 PM	#5
Breadman03 New Old School Join Date: Feb 2012 Location: Luzerne County, PA Posts: 3,293	I do it simultaneously. As far as negative effects, I don't see any, but a period of neglect previous to having the AWC set up resulted in a massive buildup of nutrients that I'm fighting.