Venturi injectors are very tricky to get to work in pool plumbing. The operating pressures between input and output are very limited so make sure you look at the tables for each version and check the input and output PSI requirements. The delta PSI between the input and output determines the flow rate from the tank and sometimes you don't know what those pressures will be until you cut into the pipe.Sabot said:I am researching pros/cons of using a Venturi Injector for my Liquidator and PH Adjuster downstream of the filter/solar. This way, when I automate I can run the chase upstream for the probes. The added bonus, the chemicals stay down stream from the equipment. Thoughts on usings a Venturi Injector on systems that require suction?
Here are some links:
http://www.made-in-china.com/image/2f0j ... D-D10-.jpg
Yes, Stenners work well for acid. While they are available with Mechanical Feed Rate Control, you still want to size the feed tube according to your need. Because of the design if you use a big feed tube/motor and then use the Feed Rate Control to turn it all the way down it will wear out the Feed Rate control very quickly.JasonLion said:Yes, a peristaltic pump works very well for an acid feed. I am using a Stenner tank and pump system, that comes as a component of the Auto Pilot Total Control system, to feed muriatic acid into my pool. They make both fixed rate and adjustable rate pumps. Fixed rate is better if you have some kind of external control system, while a variable rate pump can be used as it's own control system. I assume that most of the other brands would also work.
Air leaks can be a big problem but can usually be fixed by hot gluing the barbed end of the drip buttons and also by using plumber's grease on the other end. This should fix all of the leaks.randytsuch said:OK, so this weekend I tried Mark's sugggestion, to make a homemade chlorine feeder.
It did suck in water, but at too high a rate. I had a bunch of 1/2 gal/hr drippers, nine to be exact, but it still sucked pretty hard. And, because my pool is covered, I don't need much chlorine.
But, the bigger problem was I had a few air leaks in my dripper system. This let air into the pump, and caused the pump to lose prime. The pump had to start up dry. A couple times, it would not even start at all. I had to shut it off, and open up the leave trap. For some reason, that made it work. It took me a little while, and some research here to figure out what was going on, and what was causing it.
I did hot glue things together, to keep the drippers from leaking, but I missed at least one hole.
So, for now, I removed the drippers, and the pump works fine. I will try playing with it some more, when I get some time. I am only out $10 for the drippers, an on off valve and an adaptor, so it does not pan out I won't cry over it.
I actually hot glued both ends of the drip buttons, since I was not planning to remove any, flow rate is too high as it is. But, I missed at least one spot, that I need to glue again.mas985 said:Air leaks can be a big problem but can usually be fixed by hot gluing the barbed end of the drip buttons and also by using plumber's grease on the other end. This should fix all of the leaks.
There are a couple of reasons why your flow rate may be too high. Pump run time and/or high suction at the pump. So how long are you running your pump per day and what size is your pump and plumbing?
Because I don't know any bettermas985 said:With a 1.5 HP pump and 2" plumbing, you are probably pretty close to 90 GPM. For 10 hour run time, that is a little over 2.5 turnovers per day. Is there a reason to run the pump that long?
Usage is low right now, until the pool gets warmer. Maybe a gallon a week or so, because it is covered expect for weekends.mas985 said:Also, how much chlorine do you need to put in per day and what did you measure the draw rate to be?
Tank is a 50 lb bucket for granular chlorine. Have not measured the volume, maybe 10 gal?mas985 said:Assuming 1 ppm per day, that is about 43 oz/day or 4.3 oz/hr of 6% bleach. I get about 10 oz/hr to 15 oz/hr of draw rate (depending on valve settings) but I dilute the acid by 6:1 so my effect acid draw is about 1.7 oz/hr to 2.5 oz/hr. If the draw rate is too high, you may just need to dilute the chlorine more. You just don't want the draw rate to empty the tank too soon. Refilling once per week may not be so bad, certainly better than adding chlorine once a day. How big of tank are you using?