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  1. MITBeta

    SWG Chlorine Generation too low

    My new RJ-45+ isn't generating what it should. I just ran an Overnight Chlorine Gain Test and got less than half what I was expecting. This followed a mini-ONCL of about 4 hours where no chlorine was lost at all. Background: This is my first season with a new RJ-45+ SWG. It's been running fine...
  2. MITBeta

    PSA: Don't forget to clean your Dolphin impeller

    I noticed that the suction on my cleaner was a little weaker than normal. Sometimes it wouldn't get all the way to the top of the wall. The other day I removed the impeller and cleaned all the hair out (3 daughters...) and voila! Suction power was back.
  3. MITBeta

    Call me paranoid: do I have to worry about hydrogen build up under the solar cover?

    I noticed a number of bubbles under the cover above the return after the SWG ran for a few hours today. Should I be concerned?
  4. MITBeta

    What's my pH?

    Hi All, Went to measure pH for the first time with a new bottle of indicator and got this. pH was 7.5 at the end of last season and 7.5 when I opened 10 days ago. Fill water has always been in the 7.s as well and produces a similar result to this.
  5. MITBeta

    Circupool RJ 45+ Installation

    Hi All, I took the plunge over the Winter and bought myself a SWCG. I'm starting to plan my install now and would like some feedback on whether there will be any problems with my proposal. My 1.5" pipe makes a 90 degree turn down about 18" after the filter outlet. This vertical section is...
  6. MITBeta

    Pool Math App: How to set default bleach percentage when recording additions?

    Hi All, How can I get the Pool Math App to default to 12.5% when I record a bleach addition? It used to do this, but somewhere along the way it changed to 10%. Curiously, I track a 2nd pool as well, and it's defaulting to 6%.
  7. MITBeta

    Conflicting results between different bottles of R-0871

    I have a Taylor kit with R-0871 with best by date of 9/21. I recently bought a refill from TFTestkits of the TFTestkits labeled R-0871 (no expiration date indicated). I lent the refill bottle to a friend who is in the midst of a SLAM and she keeps reporting significantly higher values than I...
  8. MITBeta

    Helping a friend open + SLAM

    Knowing full well that no good deed goes unpunished, I helped a friend open her pool tonight and start a SLAM. Initial test showed: FC: 0 CC: 0 pH: 7.4 TA: 30 CH: 70 CYA: <<30 (not even remotely cloudy) Vinyl, 7,450 gal (18' round AGP) I added 1lb trichlor shock and tested in 30 mins FC...
  9. MITBeta

    To SLAM or not?

    I opened my pool in mid-April. It was clear with some expected leaves and so forth on the floor. So little that they cleaned up in 20 minutes or so. At opening: FC: 4.5 CC: 0 pH: 7.5 TA: 100 CH: 175 CYA: 40 Temp: 53F ONCL test 2 days later: 0 loss I didn't see any reason to do anything but...
  10. MITBeta

    TFTestkits reagent refills: no expiration date?

    I received the following reagent refills from TFTestkits: R-0013 R-0870 R-0871 None have expiration dates. How do I know they are fresh? How do I know when to stop using them?
  11. MITBeta

    New Dolphin, side jet stopped working on 2nd use

    Hi Everyone, I just received my Dolphin Warrior SE yesterday and ran a cycle right away. I was impressed with how well it worked, especially since the pool was exceptionally dirty following a very windy day. However, today when I ran a new cycle, the cleaner gets to the top of the wall and...
  12. MITBeta

    Conversion to hard plumbing for AGP: Plumbing design question regarding filter GPM

    Hi All, Before starting up my AGP this season I want to get rid of the flexible tubing and hard plumb everything. I am planning to use 2" Sch 40 PVC with the equipment in my signature. My question is regarding the flow rating of my filter. The manual says that it has a "design flow rate" of...
  13. MITBeta

    Robelle Winterizer - What's in it?

    Hi Everyone, I'm trying to help a friend out with love closing her pool and she just told me that she got pool stored and poured Robelle Winterizer into her pool. Anyone know what's in it? I can't seem to find any details. https://www.robelleind.com/Products/Winterizing-Chemicals-Robelle/
  14. MITBeta

    Wall climbing robot for AGP?

    I understand that AGP robots are not designed to climb walls because they can't overcome the sharp transition between the floor and the wall. My question is: how "soft" does the transition have to be, and is there any way to tell if any robot will climb my pool's wall? My pool has a softer...
  15. MITBeta

    Funny story

    Yesterday afternoon I found a length of 1/2" PVC in the garage, cleaned it, and marked it at 24" from the bottom to use as a dip tube for water sampling. I used it to fill my sample bottle and then started in on my weekly, full set of tests. First test: FC 13. That's odd, I thought. It should...
  16. MITBeta

    Filter Backwash Pressure Recommendation: At what speed?

    I have a 2-speed pump for my Above Ground Pool with a DE filter (model numbers in signature). The rule of thumb here seems to be to backwash the filter when the pressure rises 25% over clean. My question is: at what speed? My filter was at 16psi on high speed 6 weeks ago when I did the...
  17. MITBeta

    Can I walk on the top wall of a metal frame AGP?

    Subject line says it all. I've been assuming that I can't, but I just can't reach the back octant of the pool with the vacuum pole and it would be real convenient if I knew for sure the walls/uprights would support me.
  18. MITBeta

    Algae - again?

    I noticed lots of greenish-brown "dirt" at the bottom again today after vacuuming last night. Dove down the investigate - "poofs" away when I touch it. Thinking it's algae, again, after completing a SLAM 2 weeks ago (met all 3 exit criteria) and battling algae (realized in retrospect) all last...
  19. MITBeta

    Stain on Vinyl liner - what is it?

    Hi Everyone, I've been lurking here for a few weeks after stumbling upon this site while trying to understand the breakpoint chlorination section in my Taylor test kit manual. I have since adopted the TFP way, completing my first SLAM about 10 days ago and finally solving the mystery of why...