KonradTO
Valuable Member
Hi all,
I recently built a DIY PVC overflow with some scrap material I had around. The overflow works perfectly when I test it in the shower, but as long as I connect it to my sump it looses prime when the pump turns off. The built is similar to the one from the "King of DIY" but with some modification, for example I do not have the "T" connection for priming outside of the tank.
In the picture taken from the video there is a rough scheme of how it should work, the level of the water when the pump is off should not go below the level of the outside "T".
I
In my case instead the level goes a bit below and lets air in the siphon, thus loosing prime. The only differences from the Kingofdiy build are that 1) I did not add the red part, which as far as I understood is meant to be used for priming the first time and 2) Instead of the "U"s, which I did not have, I used some screwable siphons for the tap (picture below) which are essentially Us which can be opened for cleaning. My impression is that when the return pump turns off, the water still flowing in the siphon "sucks" all the remaining water in the pipe for few seconds before stopping, and this breaks the siphon.
Am I loosing some important bits? maybe the red part lets also the excess water to discharg "pressure" when the return pump stops? I am a bit puzzled because when I test the bits in the pictures everything works, but as long as I
connect the rest of the pipes going to the sump I get this problem. Any ideas?
Ps. No, I cannot drill the tank and I don't want to buy an hob overflow. Many people have no issues with this kind of DIY and I want to make it work without buying an expensive plastic box.
also, I am connecting a peristaltic pump to the top of the siphon, sucking out the air that accumulates from time to time in the pipes.
I recently built a DIY PVC overflow with some scrap material I had around. The overflow works perfectly when I test it in the shower, but as long as I connect it to my sump it looses prime when the pump turns off. The built is similar to the one from the "King of DIY" but with some modification, for example I do not have the "T" connection for priming outside of the tank.
In the picture taken from the video there is a rough scheme of how it should work, the level of the water when the pump is off should not go below the level of the outside "T".
I
In my case instead the level goes a bit below and lets air in the siphon, thus loosing prime. The only differences from the Kingofdiy build are that 1) I did not add the red part, which as far as I understood is meant to be used for priming the first time and 2) Instead of the "U"s, which I did not have, I used some screwable siphons for the tap (picture below) which are essentially Us which can be opened for cleaning. My impression is that when the return pump turns off, the water still flowing in the siphon "sucks" all the remaining water in the pipe for few seconds before stopping, and this breaks the siphon.
Am I loosing some important bits? maybe the red part lets also the excess water to discharg "pressure" when the return pump stops? I am a bit puzzled because when I test the bits in the pictures everything works, but as long as I
connect the rest of the pipes going to the sump I get this problem. Any ideas?
Ps. No, I cannot drill the tank and I don't want to buy an hob overflow. Many people have no issues with this kind of DIY and I want to make it work without buying an expensive plastic box.
also, I am connecting a peristaltic pump to the top of the siphon, sucking out the air that accumulates from time to time in the pipes.
