Macguyver6940 Posted January 6 Report Posted January 6 Hello hive! Third post, this is regarding a newly acquired United Spas Executive model. I have more data and new discoveries to to share!! So I learned that this spa is from 2007, and it is in very good condition for its age. I have found and fixed the only leak I could find on the bottom drain, and now its time to repair/upgrade other issues. First the pump seal was fount to be leaving a trail of leakage - pretty notable. I pulled the 5HP Waterway brand pump and was able to locate the new seal. Removing the impeller was another story!! Ended up cracking it in my attempt to unscrew it. Is there a trick to getting these off? Fortunately the replacement is readily available and pretty cheap! My plan is to run Bromine on this tub, the existing Ozone generator is a relic (UV type from 2007), so it will certainly need replacement. The other issue I found there is that this spa does not use a recirc pump, nor does it have a blower! The ozonator appears to be plumbed into the air suction tubing, and as such will only inject with spa running the jets - not good! AT this time I am considering adding a recirc pump, either utilizing the existing 5500W heater, or making it a completely separate loop, drawing from the pump inlet to (new) circ pump -> O3 venturi -> new dedicated jet. The other possibly would be employing a small 120V heater element to run in conjunction and plumbed inline with the O3 system only. This option would also make it easy to integrate some solar input to this new recirc/o3/heat maintain loop. One question I have is that I have read here that Ozone should have plenty of contact time in the tubing before entering the tup so as to not destroy the cover. Sooooo, how much tubing? What size? Any other req's? Current controls are ACC SmartPack 1000, but industrial controls are my area of expertise from my days in the trades, so I don't feel intimidated in making a parallel heating control loop. What say you all to my hairbrained plans? @waterbear, @RDspaguy, @CanadianSpaTech Quote
CanadianSpaTech Posted January 6 Report Posted January 6 10 hours ago, Macguyver6940 said: Ended up cracking it in my attempt to unscrew it. Is there a trick to getting these off? No They all (95%) break and should be replaced in most cases anyway with a new seal kit. Important to grind down the shaft of the motor just behind where the impeller threads are. A lot of time when you have a leaking seal or a seized shaft (impeller locked into the seal) it is caused by the metal just behind the thread expanding due to centrifugal force of the spinning shaft. The metal will expand and either start a leak or lock the impeller into the seal. Before installing the wet end housing thread the new impeller onto the shaft and make sure it is not tight and spins on freely. If tight... grind down the shaft a bit. 10 hours ago, Macguyver6940 said: so it will certainly need replacement. I would not. You can spend the money but if you have a good maintenance routine and keep your filters clean you would likely not miss it one bit. JMO 10 hours ago, Macguyver6940 said: AT this time I am considering adding a recirc pump, Again you can spend the money but the amount you will spend would take a (long IMO) time to recoup any savings. Make sure the GPM matches what the heater and sensors require. 10 hours ago, Macguyver6940 said: Ozone should have plenty of contact time in the tubing before entering the tub To be effective it needs a 24h circ IMO. You could add a mixing chamber and have less running time: https://www.hottuboutpost.com/coast-spa-tube-acrtube-v2-crystal-clear-ozone-mixing-chamber/ 10 hours ago, Macguyver6940 said: as to not destroy the cover. Yes ozone can cause the cover to deteriorate over time but I would question whether the ozone is the main cause or if closing the cover right after adding chemicals and not allowing enough time for the chemicals to off gas before closing it. 10 hours ago, Macguyver6940 said: What say you all to my hairbrained plans? If you are doing all this just to add ozone save your money and spend it on a proper test kit (Taylor) keep your filters clean (weekly/bi-weekly at most) and maintain your spa. Read up in the chemical section of this forum. JMO 1 Quote
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