Pump Speed, Run Time, and FC generation questions

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K

Katygreys

Gold Supporter
Mar 5, 2022
340
Katy, TX
Pool Size
18000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
I'm currently a jug-lugger, been on the TFP wagon for 1 year 2 months and 29 days. Might make the switch to the SWG switch this year. Questions:
  1. I have Hayward SP3215X202 pump. It's a 2 speed pump. What are the 2 RPMs that it runs at for low and high speed?
  2. What wattage is consumed at each speed? (can't find either on the interwebs)
  3. What's the deal with Hayward SWG's? The biggest mama-jama produces 1.47 lbs/day. I can lose 5ppm FC in the summer. I currently run my pump for 6.5 hours per day only on low speed. If I ran the T-15 for 6.5 hours at 100% in my 18,000 gal pool I would only make half that. Should I consider a bigger SWG from another manufacturer?

Ok, so here is my line of reasoning....if I get the biggest SWG Hayward has, the T-15, I am either going to have to run my pump a lot more than I am now, or run it a bit more than now at 100% leaving no room to bump up percentage and I'll have to resort to running the pump more anyway for higher bather load/whatever. This is why I am curious what the RPM and power consumption are on both low and high speeds. How much more in electricity is the SWG gonna cost because I have to run the pump more (and secondarily...it makes me wonder how much sooner I will have to replace my pump because I am now running it more often). Now look, I get that many here run their pump 24/7 on low (and I wonder what MY low is on my 2 speed pump versus the low on a VS pump). I would sorta rather stick with a Hayward model SWG just to keep everything in my system automation the same brand and hopefully behave friendly.

Are there other SWG's I should consider that produce more FC/day? It seems crazy that Hayward doesn't make a bigger SWG, but I'm not an expert, maybe I don't know what I'm talking about. Should I just stick with the T-15 and run m pump however long it takes to make whatever FC I need? Ideally I'd have a big mama SWG that I'm running nice and easy at a moderate percentage for a short amount of time to prolong the life of my pump and use less electricity.

Hope that all makes sense, and looking forward to your thoughts and input.
 
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Katygreys said:
I have Hayward SP3215X202 pump. It's a 2 speed pump. What are the 2 RPMs that it runs at for low and high speed?
Click to expand...
High Speed: 3450 RPM
Low Speed: 1725 RPM

Katygreys said:
What wattage is consumed at each speed? (can't find either on the interwebs)
Click to expand...
It depends on your plumbing but here are some typical ranges:
3450 RPM: 2214 watts to 1663 watts
1725 RPM: 356 watts to 290 watts

Katygreys said:
What's the deal with Hayward SWG's? The biggest mama-jama produces 1.47 lbs/day. I can lose 5ppm FC in the summer. I currently run my pump for 6.5 hours per day only on low speed. If I ran the T-15 for 6.5 hours at 100% in my 18,000 gal pool I would only make half that. Should I consider a bigger SWG from another manufacturer?
Click to expand...
If you are losing 5 ppm per day, I would say you have an algae problem. That is really high consumption. Most in TX and FL use about 2-3 ppm/day. However, 1.47 lbs in an 18k pool is almost 10 ppm so still doable.

I have a 20k pool with a T-15 and I have it set at 40% for 9 hrs per day right now and it is keeping my FC level at around 7 ppm. This adds a little more than 1 ppm per day.
 
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For another comparison from our region, I have a Circupool RJ-45 which is similar to the Hayward models. I have mine currently set to 20% and I keep my pump running (on low speed) 24/7/365 because I get a lot of surface debris out here in the country. When I was dumping liquid for the first 7 years with this almost 18K pool, a half gallon of chlorine was my pool's eating habit each day (~ 2.5 ppm) like clockwork. I kept my CYA at 60-70 with our heat.

I went nuts last year trying to fabricate what I expected to be an exact expectation of FC production for my SWG. I later learned that that is not only impractical, but not really needed. As long as the cell is maintaining your desired FC level, it's doing its job.

SWGs certainly make pool life easier, but the water still needs our help to ensure the CYA is ideal and to run an Overnight Chlorine Loss Test if we believe we are losing more FC than seems reasonable each day.
 
I have very little debris, hence running pump on low for only 6.5 hrs/day. If I got SWG then I’d like to not run my pump for much longer. My CYA is 50 now. Added 1.5 CYA today on my way to 60-70 which is where I typically run in the summer.

In any case, hoping to hear some additional thoughts on larger cells etc.
 
If you didn't already hear this, the general rule is to get a cell rated for at least 2x the size of your pool. This is so the cell doesn't have to work as long or as hard thereby extending the service life if the cell. If you haven't been to Discount Salt Pools online, they have a salt cell comparison chart that is very helpful.
 
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