prince Posted June 28, 2005 Share Posted June 28, 2005 hi all i have a resun sump which pumps 3800L/hr when i first got it, the sump was strong and it moved the gravel away where the water goes back in the tank. now it doesn't move the gravel away i clean the sump regularly is this cause beacuse the sump is getting old? or something else Link to comment Share on other sites More sharing options...
Ash Posted June 28, 2005 Share Posted June 28, 2005 have you cleaned the impeller in the pump? cleaned the return line? This is where I'd be looking first Link to comment Share on other sites More sharing options...
prince Posted June 28, 2005 Author Share Posted June 28, 2005 when i clean the pump i also clean the impeller i havent clean the returned line yet might try to clean it and see does it make a difference Link to comment Share on other sites More sharing options...
BaZ Posted June 28, 2005 Share Posted June 28, 2005 is this cause beacuse the sump is getting old? or something else What kind of pump is it and how old is it? Link to comment Share on other sites More sharing options...
prince Posted June 29, 2005 Author Share Posted June 29, 2005 it is a submersible pump resun SP-7500 it is about 6-8 month old Link to comment Share on other sites More sharing options...
LDG Posted June 30, 2005 Share Posted June 30, 2005 some times i get air lock in my pump , this causes my pump which pumps 6500lph to just sort of half pump . i just turn it on and off and the air lock goes away, if this doesnt work you could back flush it. Link to comment Share on other sites More sharing options...
prince Posted June 30, 2005 Author Share Posted June 30, 2005 what do you mean back flush it? Link to comment Share on other sites More sharing options...
Ryza Posted July 1, 2005 Share Posted July 1, 2005 what do you mean back flush it? flush water through the system the wrong way as pumps wear there flow is decreased, the higher the quaility of the pump the less the flow will decrease over time Link to comment Share on other sites More sharing options...
prince Posted July 4, 2005 Author Share Posted July 4, 2005 hi all just clean the pump, impeller and the return line but havent seen any changes yet have anyone got any ideas? Link to comment Share on other sites More sharing options...
CThompson Posted July 4, 2005 Share Posted July 4, 2005 hi all just clean the pump, impeller and the return line but havent seen any changes yet have anyone got any ideas? ← How did you clean the return line (what method)? Did you clean it all the way through? What size (diameter) piping is on your system? How long is this return line? What size is the inlet of the pump itself? What size is the outlet of the pump itself (if different from the inlet)? Have you checked the strainer to inlet to the return line? Craig Link to comment Share on other sites More sharing options...
prince Posted July 5, 2005 Author Share Posted July 5, 2005 those are some diffuclt questions well i clean the return pipe by using a hose (what method can use to clean the return pipe?) im not sure wat is the diameter (5-6cm ) and the length of the pipe (think is about 2 metre) strainer ?? Link to comment Share on other sites More sharing options...
CThompson Posted July 5, 2005 Share Posted July 5, 2005 Prince, They are not difficult questions, but due to the fact you find them difficult is telling of your inability to fix your issue . You English in you initial post was a little unusual, as you seem to use the word “sump” when the word “pump” would have been expected. I have assumed you have just mixed the words up . You can’t effectively clean the return pipe using a hose. If you have a build up of matter in there, it is already resistant to a water flow removing it (it is after all your return pipe). You will need to mechanically clean the inside of this pipe. This can either be done by using a pipe cleaning brush (if long enough), or by jamming a small piece of filter wool into one end, and flushing it through a few times using pressure from a hose. Make sure you get it all back at the end. This should completely clean out the inside of the pipe. I would assume once again that there is a pipe leading from the pump to the tank, this pipe may also need maintenance. The strainer is where the water enters the pipe to go to your pump. If your pump is “inline” it must have a strainer of some sort. If your pump is used in an underwater situation (submerged in the sump), then I expect the strainer will be on the pump itself. Make sure the strainer is not blocked, as this will prevent water entering into the pump, and maybe not as much water can return to the sump, hence your decrease in water flow. The other questions were just trying to ascertain that you matched your piping size to the size of the inlet and outlet of the pump. 5-6 cm is absolutely massive for a fish tank, and I would suggest that you need to check a ruler to see how big it is. Craig Link to comment Share on other sites More sharing options...
Nigel Posted July 5, 2005 Share Posted July 5, 2005 I think you might find the pump needs a new impeller or there is not enough water covering it. I think you are the person that I drilled a hole in a tank for when I was there doing it I noticed that you did not have enough water in the sump. I did mention to put some water in there if I have the wrong person then try a new impeller in the pump and see how that goes. Link to comment Share on other sites More sharing options...
prince Posted July 5, 2005 Author Share Posted July 5, 2005 thanks for the advice i might try CThompson method of cleaning the return pipe where the water goes into the mini reef it is a overflow (the corner box) i also have notice that i can't add as much water as before to the tank, and the water in the overflow is quite low, before it was higher. how much is it to change the impeller? Link to comment Share on other sites More sharing options...
Nigel Posted July 5, 2005 Share Posted July 5, 2005 I dont think you will find cleaning the return pipe will make any difference. I think you will find its either the impeller or not enough water covering the pump or the return holes are not big enough for the size of the pump. The price of a new impeller you can find out from the place you brought the pump from. Link to comment Share on other sites More sharing options...
prince Posted July 5, 2005 Author Share Posted July 5, 2005 there is heaps of water covering the pump i think the return holes are big enough for the size of the pump Link to comment Share on other sites More sharing options...
Nigel Posted July 5, 2005 Share Posted July 5, 2005 If thats the case I would try a new impeller or a new pump. If you can get a different pump it might pay to try that and see if it makes any difference. Link to comment Share on other sites More sharing options...
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