Recent content by jwfrank

  1. jwfrank

    Choosing correct flow rate for chlorine dosing or metering pump

    Many thanks!!!! I went with the 0607 model
  2. jwfrank

    Choosing correct flow rate for chlorine dosing or metering pump

    I posted this on a Stenner thread. I will try a new “generic” thread. basically my question is: should I choose a flow rate for a back pressure higher than what the pool filter shows? Would it reduce the run time of the dosing pump because the flow rate is higher? I am buying a replacement...
  3. jwfrank

    Stenner liquid chlorine pump - How to choose and install

    Please forgive me if this has been answered. I am buying a replacement solenoid dosing pump for liquid chlorine injection. From years of experience, I know that I regularly use between 1 liter and 1.25 liters PER DAY to keep my free chlorine level at 2-3ppm which is fine for my pool. My question...
  4. jwfrank

    Dolphin S300i caddy assembly problem

    Thanks for your replies. Wheels seem like soft plastic. And I meant to say in my first sentence, "the robot seems to be a great PRODUCT" not problem
  5. jwfrank

    Dolphin S300i caddy assembly problem

    Just purchased Dolphin300i and it seems to be a great problem. But I stumbled on the first page of the caddy assembly. I could not get the plastic plate off to use the 2 screws to hold the verticle pole. I did not want to force it and break the plastic. Any suggestions? many thanks (See...
  6. jwfrank

    Dolphin S300i filter basket micron question

    Thanks for fast reply, Dave. Actually, my pool water looks like yours, crystal clear. But I know when I have used the aquabot, the fabric filter very often is dirty and I don't mean with what it has collected from the bottom, but with what I would call "dust". I wil see if the Dolphin also...
  7. jwfrank

    Dolphin S300i filter basket micron question

    I am replacing an Aquabot Viva whioch has given good service over 7 years. Based on reviews on TFP, I have chosen the Maytronics Dolphin S300i. the Aquabot had a fine fabric filter bag which cleaned down to 2 microns, good for fine dirt and silt. I note that the S300i has 2 options, one for 30...
  8. jwfrank

    Muriatic Acid Consumption and Borates

    [How in the world did people care for their pools before the age of the internet?] Amen to that. And especially TFP !! I live in Italy and rely on this excellent web site as a professional text book. thanks to all those who give up so much of their time to contribute answers to us newbies and...
  9. jwfrank

    spa thermai blanket and pH, will blanket control pH?

    thanks, Richard. I was hoping you would see the post and weigh in with your always-welcome advice. Does it make sense to you that preventing outgassing of carbon dioxide might actually REDUCE pH, not just keep it stable? To help stem pH increasing before the blanket, I had been keeping TA...
  10. jwfrank

    spa thermai blanket and pH, will blanket control pH?

    i recently decided to replace my hot tub cover, and in so doing, came across the idea of using a termal blanket (closed cell polyethelene foam, supposedly clorine resistent - but after receiving it I have to wonder if one needs to pay the premium for this from a spa store ??) My goal was to...
  11. jwfrank

    Closing an in ground pool

    Thanks, Richard. I guess I am lucky in finding no algae on pool opening. Certainly water temps sometimes are above 60 degrees before opening, and I have read your posts, or others', stating that this is one key in not starting algae growth. I DO use Polyquat on closing so perhaps that is a...
  12. jwfrank

    Closing an in ground pool

    Thanks, Richard. I am also considering keeping the pump running during the winter. I live in Italy and am not concerned about the pool freezing nor freezing temps in pump room. I have a peristaltic pump which dispenses chlorine. My pool is covered with a winter cover. My question is: should I...
  13. jwfrank

    Temperature Effect???

    I googled temp effect on CSI and came up with this post. I use Pool Calculator app and measure both CSI in pool at 68 degrees and hot tab at 102 degrees Assuming pH at 7.8, TA at 80. Borates and CYA both at 40, CsI changes from .1 at lower temp to .39 at higher temp Why?
  14. jwfrank

    18% Stabilized chlorinating solution

    Thanks to all who responded 1/ definitely a liquid 2/ weight is indeed 55 pounds. Not sure how many gallons/liters. 3/ I indeed tried testing. Using JasonLion's provided formula: 10ml into 1 liter twice, then using FAS-DPD, I needed 36 drops to change the red liquid to clear. Jason had...