Orp vs. high chlorine

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bobobi-wan
Pool Enthusiast
Pool Enthusiast
Posts: 25
Joined: Tue 14 Apr, 2009 11:37
My Pool: university pool(150,000 gal)and 2 spas.pentair pumps and filters
Location: phx az

Orp vs. high chlorine

Postby bobobi-wan » Wed 20 May, 2009 13:51

what is the best way to lower the chlorine in a pool that has a controller that measures orp.previous methods included lower orp set point (not reccomended by controller people)and raising orp with mps and riding it out.chlor-out lowers orp as it lowers chlorine.


Me...
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Joined: Thu 26 Feb, 2009 11:11

Orp vs. high chlorine

Postby Me... » Wed 20 May, 2009 14:20

A bit confusing there. ORP is a value commonly accepted as being a measure of the chlorine level in the water. In fact some PPM controllers actually only measure ORP and use math to convert and display a PPM value.

If your ORP controller is putting too much chlorine in the water and the controller is properly calibrated, then you simply lower the ORP setpoint. That is exactly the right thing to do. If the ORP reading seems to spike to very high readings and then eventually settles back down then you need to

1. decrease on time. or

2. increase off time. or

3. dilute the solution. or

4. Slow down the feed rate.

If you use anything to lower the chlorine reading such as Sodium Thiosulphate you need to make sure your probes are isolated until the water settles. That stuff hitting the probes will most likely destroy their ability to read properly.
bobobi-wan
Pool Enthusiast
Pool Enthusiast
Posts: 25
Joined: Tue 14 Apr, 2009 11:37
My Pool: university pool(150,000 gal)and 2 spas.pentair pumps and filters
Location: phx az

Orp vs. high chlorine

Postby bobobi-wan » Wed 20 May, 2009 15:53

I have reduced feed rate,put in #3 stenner tubes(from #5)and I wondered about diluting the chlorine(I have 30 gal.barrels).The Shasta rep says that heat we have in Az. might affect the need for a 650 orp min. and he suggested lowering the orp to whatever will keep the pool at 1.5 to 2.0. I was using thiosulfate almost daily,about 3 oz.,or letting the sun burn off the excess.
Me...
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 302
Joined: Thu 26 Feb, 2009 11:11

Orp vs. high chlorine

Postby Me... » Wed 20 May, 2009 16:57

What controller?
bobobi-wan
Pool Enthusiast
Pool Enthusiast
Posts: 25
Joined: Tue 14 Apr, 2009 11:37
My Pool: university pool(150,000 gal)and 2 spas.pentair pumps and filters
Location: phx az

Orp vs. high chlorine

Postby bobobi-wan » Mon 01 Jun, 2009 12:52

Poolcomm Cat 4000.and I just had another flow switch go down,they need to improve their sensors.

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