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What do I select for Sanitizer in the PoolMath app if I use CalHypo Shock Treatment?

Welcome to TFP!

Not do derail the topic, but I'm curious how are you managing your CH levels? Most people in Arizona have trouble keeping their CH down when using liquid chlorine or an SWG, it must really rise fast if you're adding calcium every day.
I don't add calcium every day. I add about a 2 bags of CalHypo every week sometimes a bit more frequent. I just refilled my pool and Calcium was in the 80s to begin with. I usually drain my pool every two years to avoid high Calcium numbers.

FC and CYA - Justifying the increased cost of Liquid Chlorine

Your signature indicates you use "test strips/Leslie's testing".
Is that still the case?
If not, update your signature
If so, you really need your own test kit to test the pool water yourself.
Test Kits Compared
The TF-Pro Salt will have all the items needed to easily test your pool water.

You will be better served by installing a heater bypass. This will allow running the pump at a lower speed when the heater is not needed. The SWG requires a certain flow (every pool is different) to satisfy the SWG flow switch. The heater restricts that flow and requires a higher pump RPM to produce the same flow as when the heater is bypassed.
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OCLT good…but algae still in pool

If you've broken the biofilm and allowed chlorine to get to the algae, I doubt the biofilm can recover again that fast.
wouldnt this mean that as long as you break the film and there is sufficient FC that the algae should die once agitated? So if you agitate the whole pool once, it should all die and you could clear the pool in a day?

Where does it keep coming from?

Pool newbie needs some guidance

That depends how your draining. We don't recommend you use your pool pump to exchange water. A submersible pump is recommended for water exchanges. You can purchase from any of the big box stores or Amazon, or rent from Home Depot or Lowe's. I don't have any specific recommendations because there are many out there, but I own a Superior 3/4 horsepower version I haven't needed to use yet.
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Green pool not clearing

It was against my recommendation. Hubby did these things while I was at work. I take care of the water testing and reading the forums to take care of the pool without a pool store. However, he did see that my testing is accurate! The pool store sold him the clarifier, but the sand was totally his idea. I told him that sand never wears out and just needs cleaning, which is what he was supposed to be doing. He saw the sand was dirty and had black stuff in it so he changed it out. And now it’s clear👏🏽
I disagree that sand doesn't wear out. The pool I inherited when I bought my house was really having no effect on filtering the water. I took the valve off the sand filter and found the sand grains to be completely smooth and round, totally unlike pool sand which is "spikey" all over. It's possible they used the wrong sand, sooooo much was wrong with my pool that very little would have surprised me.
Needed new media anyway. So I went with recycled glass media and couldn't be happier. (9th year now)

OCLT and SLAM

Then a SWG would certainly help you out.
Look for one that is at least 2x our pool volume.
If you don't have automation, the Circupool RJ45+ would be good. The RJ60+ would be better as it would allow running the SWG and pump less.

Update your signature with specifics about your pool equipment (manufacturers and model numbers) and test kit info.
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FC and CYA - Justifying the increased cost of Liquid Chlorine

Can you post pictures of your pad before we weigh in...in general, you want your flow switch to be horizontal or best case on the up flow. I don't think it matters on the cell, but let's see what you have.
Mine runs down to 6-700RPM. Every pool is different, but I'd be surprised you have to run that high.
Great to know. I'll experiment with lower speeds.

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OCLT and SLAM

Living in the PHX area, you shouldn't need to do a SLAM every May.
Just maintain the pool in the off season just as you do the rest of the year. In the off season, it takes very little time and effort to do.
Easier said than done - seems most of my work trips to India are in off-season, so I'm gone for 7-12 days at a time. The wife forgets to add chlorine, and I mostly forget to remind her when I'm traveling. I'm actually kind of nervous of a 12 day trip I have in July. Hoping not to come home to a green swamp.

Anyway, I just do the SLAM prior to opening the pool to compensate. Some of this may be PTSD (Pool Trash Springtime Debris) from my old house which even the SWG could not keep up with the palo leaves and beans being dumped in there for weeks on end. I've been meaning to add an SWG, but other stuff keeps breaking on the house.

I need to add a little CYA to bring it up from ~30, then I'm all set for summer - and the onslaught of yellow lab hair!
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What do I select for Sanitizer in the PoolMath app if I use CalHypo Shock Treatment?

Welcome to TFP! :wave:

Don't use CalHypo to chlorinate in the PHX area.
Our fill water tends to be high in calcium to begin with. And with our high evaporation rates the calcium level of the pool water will increase pretty quickly.

How are you testing your pool water?
Test Kits Compared

Post a full set of current test results from your own test kit
FC
CC
pH
TA
CH
CYA
Salt (if you have a SWG)
Water Temperature

SWG Going Bad?

Welcome to TFP! :wave:

Add 3-5 ppm of liquid chlorine daily until your test kit arrives and you can provide quality, accurate numbers.
Use PoolMath to determine how much liquid chlorine that is, based on your pool volume and strength of liquid chlorine.
Obviously still waiting on my test kit but wanted to share that I added 128oz of 10% liquid chlorine a few hours ago. Tested with a strip (that’s all I have at the moment) a few minutes ago and zero FC reading.

Guessing CYA levels are still low though I’d assume they should be at least in the 45 range after adding 4 pounds a few days ago when it was at 28

Losing pressure

What RPM are you running your VS pump at?

Does your sand filter have a push/push backwash valve or a multiport backwash valve?
  • Backwash your filter until the backwash water runs clear (or relatively clear since you are in a SLAM and the water is still cloudy)
  • Place backwash valve back in filter position
  • Run pump at 3000 or higher RPM
  • Note filter pressure
  • When filter pressure rises 20%-25% above clean pressure at the same RPM (3000 or higher), it's time to backwash again
While in the SLAM, filter pressure can rise quickly and you will need to backwash more often.

The air shouldn't be affecting the need to backwash.

Take a double dose of P.O.P (Pool Owner Patience).
It took some time for your pool to get to the point of needing to SLAM.
It will take some time for you to complete the SLAM as well. A sand filter probably takes the longest to clear a pool.

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