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08-22-2019, 10:11 PM
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#1
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Senior Member
City: Beaufort, SC
Vessel Name: TAMI II
Vessel Model: Tollycraft, 44 CPMY
Join Date: Aug 2016
Posts: 148
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Blackwater hose cleaning
I'm planning to use Sew Clean or Raritan CH (I'm told they're the same) to try to clean out my black water hoses.
My plan was to turn off the raw water supply to my Raritan Crown Head and add the diluted Sew Clean to the bowl and flush the cleaner into the lines and let it sit the recommended 6-12 hrs.
Then occurred to me that by turning off the supply, the macerator impeller won't run dry because of the added solution but the supply impeller will because the raw water is turned off.
Am I correct that this could burn up the supply impeller?
Should I make a guess as to how much raw water in brought in with the flush and leave that guesstimated amount out of the 1:5 dilution of the cleaner concentrate?
Anyone have experience with using these products with a similar raw water head?
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08-22-2019, 10:47 PM
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#2
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,308
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Peggie Hall will be along soon to give you the straight dope. She actually invented Raritan CH.
I think Peggie usually recommends dilute muriatic acid to clean hoses.
The intake pump on the Crown is a small rubber impeller pump. Yes running it dry for more than a few seconds could damage it. It shouldn’t be hard to remove the impeller before you start.
__________________
Parks Masterson
Retired from Hopkins-Carter Marine Supply
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08-23-2019, 05:46 AM
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#3
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Guru
City: Annapolis
Vessel Name: Ranger
Vessel Model: 58' Sedan Bridge
Join Date: Aug 2013
Posts: 7,088
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Can't speak to your impeller question, but I can say I did have good luck when we had to use Sew Clean once. I removed the discharge hose from our toilet first, filled the hose manually, gradually... but that was also because we had a serious hard clog in that hose already...
-Chris
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Chesapeake Bay, USA
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08-23-2019, 07:25 AM
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#4
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Guru
City: AR
Join Date: Jul 2009
Posts: 2,515
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Then occurred to me that by turning off the supply, the macerator impeller won't run dry because of the added solution but the supply impeller will because the raw water is turned off.
The same motor runs both the intake and discharge impeller simultaneously, so the intake impeller will run dry if you cut off the water to the toilet.
I suggest you remove the intake line from its thru-hull (close the seacock first!) and stick it in it a bucket of Sew Clean diluted (or not, whatever the directions call for) and flush it through the system.
--Peggie
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08-26-2019, 09:22 PM
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#5
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Senior Member
City: Beaufort, SC
Vessel Name: TAMI II
Vessel Model: Tollycraft, 44 CPMY
Join Date: Aug 2016
Posts: 148
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Thanks for the above tips.
Can anyone tell me if the Raritan Crown Head looses prime if the supply hose empties when I detach it from the thru-hull?
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08-26-2019, 09:40 PM
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#6
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,308
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Quote:
Originally Posted by ORIF
Thanks for the above tips.
Can anyone tell me if the Raritan Crown Head looses prime if the supply hose empties when I detach it from the thru-hull?
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The intake pump on a crown head is self priming. If the impeller is in good shape and all connections are tight it should pick the water right up. I would guess it will self prime even four or five feet above the waterline.
__________________
Parks Masterson
Retired from Hopkins-Carter Marine Supply
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08-26-2019, 09:51 PM
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#7
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Senior Member
City: Beaufort, SC
Vessel Name: TAMI II
Vessel Model: Tollycraft, 44 CPMY
Join Date: Aug 2016
Posts: 148
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All set then. Thanks
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08-26-2019, 10:05 PM
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#8
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Guru
City: Bellingham WA
Vessel Name: Hatt Trick
Vessel Model: 45' Hatteras Convertible
Join Date: Nov 2016
Posts: 1,973
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Also have Crown heads and didn't know about Sew Clean a couple years ago. I used a plumbers snake and dock water to open things up. Truly a crappy undertaking. Did I mention I'm converting to freshwater Raritan Sea Era heads? Peggie is helping with the planning.
__________________
Ken on Hatt Trick
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