Sams Club Powder Chlorine

mknauss

Mod Squad
TFP Expert
May 3, 2014
13,630
Laughlin, NV
OK -- right off, your CH is very high. You will have scale very soon and it will be very difficult to prevent. If you plan to add salt, I would do a complete water exchange first.

You need to learn about CSI. It is calculated by PoolMath. Keeping it around 0 is preferred. We in the southwest desert deal with high CH and TA fill water.

Your FC is also quite low when using the FC/CYA chart. I assume your CC is not 2. Can you confirm that?
 

chavezone

Active member
Sep 7, 2018
33
Las Vegas
OK -- right off, your CH is very high. You will have scale very soon and it will be very difficult to prevent. If you plan to add salt, I would do a complete water exchange first.

You need to learn about CSI. It is calculated by PoolMath. Keeping it around 0 is preferred. We in the southwest desert deal with high CH and TA fill water.

Your FC is also quite low when using the FC/CYA chart. I assume your CC is not 2. Can you confirm that?
Well I've lived in my home for 5 years and have never done a water change, not sure when the pool was filled prior to buying it, since it was a complete rehab I'd say about a year before that so maybe 6 years, should I just consider a water change since it's been so long?
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
13,630
Laughlin, NV
Surprised your CH does not climb quicker. I bet your pool service used to do very large back washes fairly often from your sand filter to keep the CH down.

Yes, it will be time to do a water exchange, especially if you plan to install a SWCG. If you decide to do that, I have a method that allows you to exchange the water and not drain the pool. You will need a small sub pump.
 

chavezone

Active member
Sep 7, 2018
33
Las Vegas
Surprised your CH does not climb quicker. I bet your pool service used to do very large back washes fairly often from your sand filter to keep the CH down.

Yes, it will be time to do a water exchange, especially if you plan to install a SWCG. If you decide to do that, I have a method that allows you to exchange the water and not drain the pool. You will need a small sub pump.
The sand filter is only a few months old, I used to have a cartridge filter that was way too small for this size pool and during the hottest days of the year we did struggle to keep it from turning green
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
13,630
Laughlin, NV
The sand filter is only a few months old, I used to have a cartridge filter that was way too small for this size pool and during the hottest days of the year we did struggle to keep it from turning green
Amazing. I guess the evaporation rate in Las Vegas is that much less than mine in Laughlin. I have to drain every 16 months as my CH goes from 250ppm with a fresh fill to 900 ppm CH at the end of ~16 months.
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
13,630
Laughlin, NV
You can exchange some water without draining.

If you place a low volume sub pump in the deep end and pull water from there while adding water in the shallow end (through a skimmer or into a bucket on a step so you lessen the water disturbance) you can do a fairly efficient exchange. That is assuming the water you are filling with is the same temperature or warmer than your pool water. If your fill water is much cooler than your pool water, then switch it. Add the water to the deep end (hose on bottom) and pull water from the top step.

The location of the pump and fill hose may change if you have salt water, high calcium, etc.
In my pool, with saltwater and high calcium when I drain, I put the pump in the deep end and hose in shallow end. The water in the pool weighs more per unit volume than the fill water from the hose.

Be sure to balance the water out and water in so the pool level stays the same. Also be sure your pool pump is disabled during this process. Once started do not stop until you have exchanged the amount of water you wish.
 
  • Like
Reactions: chavezone