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Thread: Tap Water Pre-Algaed

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    frogabog's Avatar
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    Tap Water Pre-Algaed

    So I broke out the meter and tested the tap water.

    FC- .17
    TC- .96

    My tap water needs a shock... hehe. THIS is why my water turns green at about 4" upon filling and we always have to shock new water. So there! Hrumpf!

    Got interrupted by kids arriving home or I'd have ph and alkalinity to report as well. Will edit when I get a chance.

    I got the bug to do this test because:
    1) I have the equipment (Hannah Meter - tests under 1ppm) and,
    2) Recent arial views of the uncovered reservoirs that got peed in and then drained on the news showed GREEN water.

    Oh, we drink this stuff happily btw. Algae won't kill ya, apparently it's perfectly fine to drink it. The water is soooooo good btw. Even better than bottled.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    JasonLion's Avatar
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    Re: Tap Water Pre-Algaed

    Some drinking water supplies use monochloramine (CC) for disinfection, instead of chlorine, so your water might not be so bad as all that.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    frogabog's Avatar
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    Re: Tap Water Pre-Algaed

    Oh... ok. Yes, that's it. So... how does that work in favor of less algae'd water? See below, from the water bureau's website.



    Testing & Sampling Portland's Water

    The Portland Water Bureau treats Portland's water with chloramination. This process starts with chlorine to disinfect the water. Next the city adds ammonia to ensure that disinfection remains adequate throughout our distribution system. New federal regulations are being developed and may require additional treatment processes by 2013.

    The Portland Water Bureau also adds sodium hydroxide to increase the pH of the water to reduce corrosion of plumbing systems. This treatment helps control lead and copper levels at customers' taps should these metals be present in the customers' home plumbing.

    Portland's water is currently not filtered. The Bull Run source meets the filtration avoidance criteria of the 1989 Surface Water Treatment Rule and has had a waiver from the requirement to filter since 1991.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    Re: Tap Water Pre-Algaed

    The 1 ppm CC level is typical for chloramination and is monochloramine. That level will often inhibit algae growth, but the reservoir water you refer to wouldn't be chloraminated -- that process is done just prior to distribution in the piping from the water treatment plant to your house. Reservoir water is just water without chlorine nor monochloramine. So ammonia in from urine in non-chlorinated water would be akin to algae food -- a very nice source of nitrogen.
    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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    LauleaHere&There's Avatar
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    Re: Tap Water Pre-Algaed

    Quote Originally Posted by frogabog
    ...Algae won't kill ya, apparently it's perfectly fine to drink it. The water is soooooo good btw. Even better than bottled.
    And you get a full serving of vegetables with your morning coffee.
    12' round above ground pool. 3,500 gal. Vinyl liner. Waterway Supreme Hi-Flo 48 frame pump. 1.5 hp. SWG. Sand filter with Zeobrite.

    Thanks, members of Trouble Free Pool, for being so friendly and informative!

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    Re: Tap Water Pre-Algaed

    Chemgeek, I know from aquarium keeping that more and more municipalities are adding chloramine to tap water instead of chlorine. I wonder if TFP ought to insert some information about that into stickies and Pool School. Filling your pool with chloramine ought to require slightly different responses, right?
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Tap Water Pre-Algaed

    Not really. You still add chlorine to the pool to get rid of whatever chlorine demand there might be in the fill water. In the case of 1 ppm CC, it will not take more than 1 ppm FC to get rid of it (remember that the 10x rule is wrong and only applies to the amount of needed chlorine to oxidize ammonia, not monochloramine). So having a normal chlorine level upon fill is usually sufficient though a shock level makes the conversion go faster. With an FC that is around 10% of the CYA level, you get rid of around 90% of the CC after 4 hours and you get rid of around 99% of the CC after 8-9 hours -- that's at 77ºF and it would go away faster at warmer pool temperatures.
    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: Tap Water Pre-Algaed

    Thanks, as always chemgeek. I just love having smart friends.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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