Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Any advantage to borates in high pH-tending salt pool?

  1. Back To Top    #1

    Join Date
    Aug 2011
    Location
    Houston, TX
    Posts
    14

    Any advantage to borates in high pH-tending salt pool?

    I have a salt cell pool in Houston, TX. Our water supply is fairly alkaline here. On top of the alkaline water, the salt cell, of course, generates plenty of free base. I constantly add acid (~1 pint/week in a 15000 gallon aggregate plaster pool). In the summer, copious evaporation leads to the auto-fill running every couple of days. I have added an acid feeder to the pool which has stabilized my ever increasing pH and my scaling is now under control as well.

    My question: Will borates give me any advantage in this environment? It seems like most of the users on this forum were constantly having a low pH problem, not a high pH problem.

    Thanks!!!! This site is very cool - I'm on the BB method - just debating the third B.

    Alex
    15,000 gallon gunite/aggregate pool with attached spa. Pentair system with Easytouch, 1hp WhisperFlo, FNS DE filter, gas heater, Legend Platinum cleaner, IC40 SWCG, IntellipH acid feeder. Two additional 1.5hp WhisperFlo pumps for additional spa jets and 3 water features.

  2. Back To Top    #2
    bobodaclown's Avatar
    Join Date
    Apr 2011
    Location
    Lakeland, FL
    Posts
    2,351

    Re: Any advantage to borates in high pH-tending salt pool?

    Hello and welcome to the forums. What's your TA level? Have you read about water balance for SWG?http://www.troublefreepool.com/pool-...ater_generator

    I've just gotten my TA down to about 80 and the PH is climbing much slower.

    Adding Borates will act like a buffer like TA does.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Any advantage to borates in high pH-tending salt pool?

    The rise in pH does not come from the salt cell that "of course, generates plenty of free base". Though it is true that the addition of any hypochlorite source of chlorine including generation of chlorine in a salt cell has the pH rise, it is also true that the consumption/usage of chlorine is acidic and has the pH fall right back down again. This is described technically in this post.

    The reason the pH rises over time is mostly due to carbon dioxide outgassing because the TA is too high and there is more aeration from the SWG running. There may also be some undissolved chlorine gas that escapes as well. As noted in the previous post, read Water Balance for SWGs to learn more. You first and foremost want to get your TA down, probably to 70 ppm, and you want your CYA to be up at around 80 ppm so that you can turn down your SWG on-time (i.e. you won't need to generate as much chlorine since less will be lost from sunlight). The Borates help both as a pH buffer and also as a mild algaecide so can reduce chlorine demand if your pool is "on the edge", though normally if you maintain the proper FC/CYA ratio as indicated in the Chlorine / CYA Chart, then chlorine alone will prevent algae growth where at a CYA of 80 ppm you want your FC to be no lower than 4 ppm.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4

    Join Date
    Aug 2011
    Location
    Houston, TX
    Posts
    14

    Re: Any advantage to borates in high pH-tending salt pool?

    Thanks so much for your reply! You guys are phenomenal on here.

    My TA is 80. CYA is 80 too. My attached spillover spa has venturi nozzles on the four lower return jets that are connected to the main pump. It has an additional 8 upper jets that run on a separate pump. I'm wondering if the venturi nozzles are contributing to the outgassing since they are always aerating the spa. Would this also explain why my spa has more scale (in addition to the generally warmer water)? Would it be worthwhile to put a ball-valve on the air intake pipe and keep it generally closed except when using the spa? Sounds like the borates offer some benefit. I might hold off until my 2 year old is a bit older.
    15,000 gallon gunite/aggregate pool with attached spa. Pentair system with Easytouch, 1hp WhisperFlo, FNS DE filter, gas heater, Legend Platinum cleaner, IC40 SWCG, IntellipH acid feeder. Two additional 1.5hp WhisperFlo pumps for additional spa jets and 3 water features.

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Any advantage to borates in high pH-tending salt pool?

    Stopping the aeration will help the pH rise some and so will bringing your TA down to about 70 or a little less. If you add Borates you can have your TA even lower than that.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •