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Thread: zinc sacrificial anode

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    zinc sacrificial anode

    moderator Note. Moved from this thread:. zinc sacrificial anode

    Old thread... but relevant to my question
    I am putting in an 'inline' sacrificial anode just like the one below:


    The manual says put this between the filter and the heater. But, I don't have much space there.

    Can I add this just after the pump - and before the filter? I have space there.
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    UN1017's Avatar
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    Re: zinc sacrificial anode

    On their web site it says it can go in either place.

    http://www.pooltool.com/images/l_104d.jpg
    15'x30' IG - Roman-style - 14K - Pebble Fina Classico
    Filter: Jandy CL460 Pump: Jandy Stealth SHPF1.5 SWG: Jandy AquaPure 1400 Cleaner: Jandy RayVac Test Kit: TF-100 w/SpeedStir

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    Re: zinc sacrificial anode

    Quote Originally Posted by UN1017 View Post
    On their web site it says it can go in either place.

    http://www.pooltool.com/images/l_104d.jpg
    Ah ha.. I must have misread it! Thanks for pointing it out.
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Re: zinc sacrificial anode

    It is not necessary to put the anode into the water flow as that will add zinc ions into the water. You can instead place a zinc anode in moist soil (acts as a ground source for electrons and a sink for zinc ions) and just electrically connect it to the bonding wire. The idea is to put a small negative voltage onto the metal that is in contact with pool water. That makes it harder for positive metal ions to form (increases the potential that must be overcome for corrosion to occur).
    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"

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    Re: zinc sacrificial anode

    Quote Originally Posted by chem geek View Post
    It is not necessary to put the anode into the water flow as that will add zinc ions into the water. You can instead place a zinc anode in moist soil (acts as a ground source for electrons and a sink for zinc ions) and just electrically connect it to the bonding wire. The idea is to put a small negative voltage onto the metal that is in contact with pool water. That makes it harder for positive metal ions to form (increases the potential that must be overcome for corrosion to occur).
    I actually thought about this, chem geek. But, here, in AZ it is difficult to rely on 'moist' soil. Everything is bone dry... well, except for some flowers in the front yard. We have xeriscaped everything. Also, I was worried about the scaling on the zinc diminishing its effectiveness.

    In this setup, I can see the zinc through the glass and sandpaper it if it gets scaly.

    BTW, since I am putting it between the pump and the filter, will the DE filter get some of the zinc out? I assume it will not, right, since the zinc is going to be small (atomic size)?
    2015 build (link)| 16.5 K gal | Salt Water | IG rect | 35'x16' | 568 sf | 105 ft peri | depth 3'-5' | PV3 in-floor | 2 Venturi skimmers | MDX+SDX drains | T-CELL-15 SWG | Hayward Ecostar VS pump | Hayward 7220 DE Filter | Aqua Cal Icebreaker Heat / Cool pump SQ166 | Hayward Sense & Dispense PH Controller| Omnilogic | Pebble Sheen Blue Surf | Ultra UV | Stenner acid pump | Coverstar Automatic | TF-100

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    Re: zinc sacrificial anode

    Pool Filters cannot capture metals in soluble form. It is only after they have precipitated that the filter can capture them.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: zinc sacrificial anode

    i have the puck one that i put in the skimmer

    http://www.thepoolandspahouse.com/ac...C-ANODE-WEIGHT
    Chris- Macomb, Michigan 20,000 gallon pool IGP. 16 x 32 Hayward Ecostar pump. Hayward 24 inch sand filter with Zeo sand. Hayward Aqua plus P4 automation board with T-15 turbo cell. Hayward H150 heater millivolts style. Polaris 9300 robot vacuum. New maytronics titain plus vacuum cleaner Test kits TF-100 and color Q7 TEST KIT.http://tftestkits.net.

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    Re: zinc sacrificial anode

    That puck one will do absolutely nothing to protect other metal in the pool because it is not electrically connected to that other metal. Think about it. Zinc corrodes more readily than the other metals in the pool, but what exactly is preventing the other metals from corroding at the same rate as they were before you added the zinc? Nothing is preventing that.

    If you were to electrically connect the zinc to the bonding wire to other metals in the pool, then the zinc will impart a small negative voltage onto the other metals which will slow down their corrosion rates by increasing the potential that must be overcome for an ion to leave the metal (because the positive ion is attracted to the now more negatively charged metal).

    Though I generally hate referring to Wikipedia because it is sometimes wrong or incomplete, in this case in the article on Galvanic anode it is mostly correct when it says:

    For this to work there must be an electron pathway between the anode and the metal to be protected (e.g., a wire or direct contact) and an ion pathway between both the oxidizing agent (e.g., water or moist soil) and the anode, and the oxidizing agent and the metal to be protected, thus forming a closed circuit; therefore simply bolting a piece of active metal such as zinc to a less active metal, such as mild steel, in air (a poor conductor and therefore no closed circuit) will not furnish any protection.
    While they are correct about needing an electron pathway (i.e. electrical connection), the ion pathway need not be complete if there is an effective sink or source for ions due to the large volume of soil or water and a continual flow and dilution of such ions. It's similar to how ground (moist soil) is a source and sink for electrons.

    As for putting the zinc sacrificial anode in the pool water (electrically connected to the bonding wire), the zinc ions are not likely to stain since not that much zinc is expected to be added and zinc oxides/hydroxides are more soluble than those of copper and (ferric) iron. At a pH of 8.0, the solubility of zinc hydroxide is over 500 times higher than that of copper hydroxide which is over 500 billion times higher than that of (ferric) iron hydroxide (it's very insoluble).
    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"

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    Re: zinc sacrificial anode

    Quote Originally Posted by rolo918 View Post
    i have the puck one that i put in the skimmer

    http://www.thepoolandspahouse.com/ac...C-ANODE-WEIGHT
    I have the same one. I thought it was "snake oil". Wasn't sure how it could possibly do anything without being bonded. Now I know for sure. Pool supply store got me on this one.
    20X36 IG vinyl (18,000 gal), 3 sheer descents, Max-Flo 1.5hp VS 2300, Aquarite T15 SWG, C3030 filter, 250,000 BTU heater, Sharkvac XL (Hayward equip)

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