Ok, so at the start of pool season (about 6 weeks ago here), I installed my stenner pump to auto dose the chlorine. It is a simple install, it pulls the chlorine out of a 5 gallon bucket buried about 3/4 of the way in the ground. It injects to the return at a level slightly below where the stenner pump is mounted.
It is a variable speed pump that I set to 2.2 gpd and let run for 3:45 minutes (woods digital timer).
So for awhile everything was great. I was able to maintain a constant chlorine level (about 3.5 at the time due to almost no CYA) for weeks on end without adding manually. Then about 2 weeks ago the bucket ran out of chlorine before I added more. After this happened I disconnected the line from the return, set the pump to 10 gpd until it started spitting out chlorine again. I put it back in the return line and left town for a few days.
3 days later I get back the the bucket is almost empty and my chlorine level is ~11 ppm. It should have used less than 1.5 gallons over the 3 days, but instead it dumped ~3 gallons. I turned the pump off for a few days and to let the chlorine level come back down, then tried it again and same thing. Yesterday I measured the chlorine level in the bucket and then again today and I can see that it used about 5 quarts (now set to 2.5 gpd due to bumping CYA back to normal level).
TLDR; My stenner pump is set at about 2.2 gpd and timer to run for 3:45 minutes which should be about .34 gallons a day, but it is instead dosing it about 1 gal per day.
Has anyone seen anything like this? It clicks at the expected interval when running. I figure it is either pumping too much chlorine (gpd) or pumping for too long. The too long is easy to see/measure and I've never seen it running when it shouldn't be (since it would have to run 3x longer than usual I'd think I'd notice). So that makes me think it is the pump. Could this be a pressure/gravity issue that is just now a problem?
Should I maybe setup some tests with and without the pump connected to the pool equipment? I tested the pump before installing (it was used) and it did pump 10 gpd at that setting. It also seemed to have no trouble pumping only 2.2 gpd for about a month.
It is a variable speed pump that I set to 2.2 gpd and let run for 3:45 minutes (woods digital timer).
So for awhile everything was great. I was able to maintain a constant chlorine level (about 3.5 at the time due to almost no CYA) for weeks on end without adding manually. Then about 2 weeks ago the bucket ran out of chlorine before I added more. After this happened I disconnected the line from the return, set the pump to 10 gpd until it started spitting out chlorine again. I put it back in the return line and left town for a few days.
3 days later I get back the the bucket is almost empty and my chlorine level is ~11 ppm. It should have used less than 1.5 gallons over the 3 days, but instead it dumped ~3 gallons. I turned the pump off for a few days and to let the chlorine level come back down, then tried it again and same thing. Yesterday I measured the chlorine level in the bucket and then again today and I can see that it used about 5 quarts (now set to 2.5 gpd due to bumping CYA back to normal level).
TLDR; My stenner pump is set at about 2.2 gpd and timer to run for 3:45 minutes which should be about .34 gallons a day, but it is instead dosing it about 1 gal per day.
Has anyone seen anything like this? It clicks at the expected interval when running. I figure it is either pumping too much chlorine (gpd) or pumping for too long. The too long is easy to see/measure and I've never seen it running when it shouldn't be (since it would have to run 3x longer than usual I'd think I'd notice). So that makes me think it is the pump. Could this be a pressure/gravity issue that is just now a problem?
Should I maybe setup some tests with and without the pump connected to the pool equipment? I tested the pump before installing (it was used) and it did pump 10 gpd at that setting. It also seemed to have no trouble pumping only 2.2 gpd for about a month.