Noobie

PrTexas

Member
Jun 11, 2019
6
Houston tx
Decided to stop having water tested and learn how to do it. Got the Taylor Tf-100 and took my first test. I plan on moving to liquid chlorine and away from tablets. My CYA is too high and I'm hesitant to drain water. Here are results of first test. Any advice?
FC 6
TA 110
CYA 85
PH 7.5
CH 325
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,058
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.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
9,003
Northern NJ
How long you run the exchange depends on the GPM your fill hose can provide and how much water you need to exchange.

You don’t run your pool pump during the exchange. You don’t want the new and old water to mix. The process works on the principle that the new and old water are different weights and will stratify if not mixed. You pump out the bottom layer while adding to the top layer, or the reverse.
 

PrTexas

Member
Jun 11, 2019
6
Houston tx
Replaced 40% of my water. Calculated by gpm and time it was filling. Here are my readings now
FC 2 (added 1qt bleach)
PH 7.5
TA 90
CH 100 (added 15lbs hardner)
CYA 60
 

PrTexas

Member
Jun 11, 2019
6
Houston tx
Great. Follow the FC/CYA Chart for FC. Stay in Target range for your CYA. Add chlorine daily.
Thanks for the help! Appreciate this forum. Pool guy scoffed at me when I stopped by and told him I was moving to liquid chlorine. He said..."oh well you will have really high total dissolved solids". Is that something to worry about or just their propaganda?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,058
Laughlin, NV
TDS is meaningless. Only Dissolved Solid liquid chlorine adds is salt. Which is non reactive and of no consequence.
 
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