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Moved from here... https://www.troublefreepool.com/posts/1735352/bookmark There is no longer enough flow to power my Great White crawler thing. I used to get it to run when the vacuum guage reads 12 in Hg (adjusted by partly closing the floor drain valve). But now at that setting the flow...

It seems that the K-2006 has been replaced by the K-2005. The powder is gone, replaced by two liquid reagents. Are there special TFP instructions for using this formulation? Before I would use 1 scoop of the DPD powder.

Thank you. I have updated some recent log entries to record salt levels (from my spreadsheet I use for plotting) and turned on tracking for it.. Salt level was staying steady at 3100 until this recent pattern of daily thunderstorms. I will change my goal pH higher, I was just going by the...

My history of measurements is in my TFP profile. Suddenly after several days of rain, my CSI is down to -0.52 and I need guidance on which factor to correct first. I have had to drain about 1.5 inches of water out of the pool, and add 10 lbs of salt. None of the numbers look unusual except...

I shut my solar heater off two weeks ago, as the sun shining on the pool is enough to warm it to 94 degrees or more. But three fourths of the year the solar system comes on as the Sun is lower behind the trees, and putting energy into the water in the morning helps extend the season. In the...

It has two "test tubes" joined together into one piece of plastic which also incorporates the pH color chart. The smaller tube is used only for the CYA test. The larger tube, marked at 10ml, 25ml, and 45ml points, is used for everything else. The FC and the PH tests both use the large tube.

I found out by accident that cleaning carefully after doing the FAS-DPD test is really essential if you do the pH test next. Any contaminents in the test tube from the FAS-DPD test will make the pH read super high. To help, I now also always do the pH test first.

The instructions say two scoops regardless of which sensitivity you use. I use the 10mL level anyway so if one scoop is enough I'll do that.

I have a Taylor K-2006 test kit which includes the FAS-DPD test with the tube of powder R-0870 and a tiny spoon for measuring it. I am on my second such tube of powder. I notice that the little sccop never really empties even though I tap it over the comparator tube. After a while whatever is...

If the flow is low and the cell is installed upright (with the larger side on top) then they say the plates will not be sufficiently covered. Among other things this could lead to a "low salt" reading, which is computed based on the observed current flow. New guidance is that the cell be...

Yes, that is the approach I have been taking - small changes. I can adjust power in one-percent increments. FC has been trending low the last two days so I increased power to a level that should result in a +1 ppm change per day to bring it back into the desired range. Also found CYA was a...

Shouldn't the SWG power setting be exactly the same in the steady state, regardless of FC level? I would think that the power setting controls how fast it changes, not what it settles at.

At least this confirms that I understand the math properly! Thank you. Now should I want to increase FC by 2 ppm per day, I would set the power knob to (1.54+2.0)*9/1.54 = 21% then when it reaches the desired level back it off again to 9%.

I am gradually adjusting my new SWG to maintain a constant FC. I figured that if the FC, TA, and CYA are constant over 24 hours then I am adding Chlorine as fast as the Sun etc is eating it, so I set about to calculate how much that was. (Log is in my profile) The cell is rated at 1.45 pounds...

To clean behind the light, do I just take the end of the vacuum hose off the Kreepy Krawly and run it around in there, then wash the filter? How does algae survive in darkness?

I just had a SwimPure Extreme installed and there was something wrong with how the rectifiers were wired, so double check that. When it was pulling any power the box was humming like crazy, indicating that the rectifiers were probably hooked up backwards and delivering 'half-wave' rectified...

One Amp-Hour moves a certain number of electrons through the cell. (I forget the number as its been decades since I took those courses, but its a lot.) Each electron through modifies the metal in the cell at a subatomic level. After enough of this going on, there is not enough of those metals...

The Acid Demand test is the second step in the pH test. It tells you how much acid to add to get the pH where you want it. Very useful. Or PoolMath willl compute it for you.

Just got new Hayward "SwimPure Extreme" 40,000 Gallon SWG installed and the manual has updated that CSI chart again. Instead of subtracting a fixed 12.1 there is a new term based on "Total Dissolved Solids". From my research here, this is largely a useless measurement, so I will just go with...

My intent is to follow the TFP guidance. But replacing or cleaning a SWG cell is a lot cheaper than replastering the pool! Doesn't overly negative CSI eat at the walls?

Interesting about CSI. Poolmath gives me -0.3 (that's bad by their rules, ok by TFP) but following the formula in the SWG manual I get +0.06 (that's good). Their formula for "Saturation Index" is Si=pH+Ti+Ci+Ai - 12.1. Those 'i' values come from looking up temp, CH, and TA in a little table...

I have been playing with the various goal ranges suggested by the Poolmath web page and comparing its suggestions with what it says in my SWG manual. I am wondering about the difference between the "Traditional Pool" and "Troublefree Pool" settings. The "Traditional" goals pretty match what is...

The thing to look for is a slight brown discoloration in the plastic. On mine it was on the center conductor. That is a sign of overheating, which can happen if the connection is not solid.

My pool has an Intelliflow pump which has its own internal timer. Currently it runs 24 hours/day at 1000 RPM (about 65 Watts) and speeds up when the solar panels call for it. The idea was, run for longer hours at a lower speed so it does the same amount of filtering but is quiet about it. The...

If using salt intended for water softeners, be sure to use plain salt, not the kind with additives for removing rust, etc.

Wiggle the connector where the cell cable plugs into the bottom of the Nano control box. I found that mine was flaky, though I was getting Low Amps not Low Volts. The design of that connection is not very robust.

Some brands have a screen filter at the inlet of the cell that is supposed to be checked from time to time. Mine has a bypass path around that filter so if it got clogged you would never know without looking!

Our Digital Nano SWG has been a lot of trouble. From time to time it will start complaining "Low amps. Cell?" and checking the readings shows either 0 Volts 0.2 Amps, or 32 volts 0.2 Amps. The correct reading would be 17v, 5A. Of course with the low amps, it is not producing Chlorine...

Tech guy (who says he has tons of experience with SWGs) diagnosed it as a bad power supply. At least I do not have to replace the whole board.

When we added rooftop solar heating we had to upgrade to a VS pump just for the noise. On low speed, the pump did not generate enough pressure to get the water up to the roof and enough flow for the SWG. On high speed it could do both of those things at the same time but was very noisy. Since...