How much does flow rate affect SWG production?

[pinguy]

With temps finally getting warm, I was able to add salt and turn on the SWG this past week.

My current pump schedule:
1AM -3AM: 3450 RPM
9AM - 11AM: 1500 RPM
1PM - 5PM: 2350 RPM

I have the cell running at 100% but my FC has been in the 1.5-2.5 range when I've tested the past couple days. I've supplemented with liquid chlorine/and some older "pre-tfp" dichlor to bring my CYA up. CYA is about 50 right now.

Should I add time or speed? I feel like it should be producing more FC for 8 hours of run time. The cell looks fine, and it was new last year.

 

[ping]

When in doubt if the SWG is producing like it should, you should run an OCLT to rule out organics consuming the chlorine.

If the water passes the OCLT, then you know that you need to increase the run time and/or % output.

 

[pinguy]

Will do tonight. I do see a CC of 1 when my FC drops below the minimum, but it always goes away when I bring it back up. That's not a regular thing, just these past few days trying to get the SWG tuned in.

 

[pooldv]

Add some bleach to get it back to target while you are dialing it in.

 

[pinguy]

Passed OCLT. Back to my original question, would changing speed or time be better? I feel like 8hrs run time is a lot.

 

[ping]

If you are happy with the filtration, then bump up the output % on the SWG.

 

[pinguy]

If you are happy with the filtration, then bump up the output % on the SWG.

Like I mentioned in my OP, It's already at 100% and not producing enough FC.

 

[jblizzle]

The speed does not impact the SWG output. Either there is enough flow and the SWG works, or the SWG does not work.

Verify it is generating at the 1500rpm. If it is, then the only option is increased run time. If it is not, dial up that speed until it does generate.

Raising the CYA to the recommended level will also help.

 

[RobbieH]

Changing speed will do nothing. If you are not already running 24/7, then adding time will increase chlorine output, as long as the SWG is set to run anytime the pump is running.

 

[pinguy]

Yes I'm going to finish raising CYA, I just wanted to get rid of the dichlor I had first.

I'm going to bump it up to 12 hours or so at slower speeds, I don't think running at 3400 RPM is advantageous.

Thanks.

 

[RobbieH]

Running at 3400 is only advantageous to the stockholders in the power plant.

You will be surprised how much going from a CYA of 50 to around 70-80 will be. I was at 50 at the start of the year and at just over 70 now, and it made a big difference.

 

[pinguy]

Something still isn't right here. I increased my pump time to 12 hours and everything seemed fine. My FC was around 10 at the end of last week, so I bumped down the percentage 10% or so.

Then I got back after being away this weekend, and FC is .5, CC was 3!

Sigh...bringing things up to SLAM level now with liquid. I'm not sure why I can't get this dialed in. It was super simple last year.

 

[jblizzle]

That is not normal for the FC to suddenly drop and the CC to rise like that.

 

[pooldv]

As water temps ramp up chlorine usage also ramps up. It is always tricky to gauge how much and how fast. I usually try to aim 1 or 2 above target for some extra cushion. SLAM is the right answer!

 

[pinguy]

That is not normal for the FC to suddenly drop and the CC to rise like that.

I'm confused too. CC went away as soon as I raised FC levels. Water looks perfect as always.

 

[pooldv]

Missed the high CCs. Maybe some geese dropped off a surprise on the way by or something.