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Rainwater Tanks: Preventing Algae Formation in Mauser 1000L Tanks with Proven Preparations

zybex 51696 40
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How can I stop algae from forming in 1000 L rainwater tanks and keep the water and tank walls relatively clean?

Stop the light from reaching the water: the thread’s main recommendation is to cover the tank completely with opaque NRC foil or similar light-blocking material, because algae won’t develop without light [#19447746][#19447602] A cheaper proven variant mentioned was wrapping the tank with black, UV-resistant agrotextile, which gave one user three years without algae [#19448655] If you want a nicer-looking solution, build a tight enclosure around the tanks and keep them as dark and cool as possible, because warmth and still water also encourage algae and mosquitoes [#19447814][#19448138] Avoid chemical additives; several replies warn that you would have to keep buying them and that they may end up in water used for plants [#19447746][#19447656] Also fit filters at the gutter inlet—sponges, cloth/felt, or a leaf catcher—to keep leaves, droppings and other dirt out of the tanks [#19447814][#19448537]
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #31 19450201
    andrzej20001
    Level 43  
    I don't know what you have on these roofs, to clog such a tee / siphon made of 50 mm pipes, you would probably have to live in the forest.
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  • #32 19450225
    zybex
    Helpful for users
    andrzej20001 wrote:
    I don't know what you have on these roofs, to clog such a tee / siphon made of 50 mm pipes, you would probably have to live in the forest.

    For me, the pipes are 32 mm, because I decided that they would be enough for water. Regarding the roof, I have plenty of sparrows building their nests. Sometimes young sparrows fall into the water and drown. This was the case with the tubs I had previously at this location. I happened to spot a drowning sparrow in time and save it.
    I also had deciduous trees nearby, but I cut what I could and cut others significantly.
    It's rained a bit today and the water in the tanks has even arrived.

    Rainwater Tanks: Preventing Algae Formation in Mauser 1000L Tanks with Proven Preparations

    Under the second gutter I have two tubs (and a bucket :D ).

    Rainwater Tanks: Preventing Algae Formation in Mauser 1000L Tanks with Proven Preparations

    Rainwater Tanks: Preventing Algae Formation in Mauser 1000L Tanks with Proven Preparations

    The third gutter from which I do not collect water for aesthetic reasons.

    Rainwater Tanks: Preventing Algae Formation in Mauser 1000L Tanks with Proven Preparations
  • #33 19450261
    brofran
    Level 41  
    zybex wrote:
    The bucket cannot be replaced
    Dig a small hole under the tap so that the bucket goes in. You put the bucket in the hole and pour water. You can "treat" the walls with concrete, bricks or wood for aesthetics. :|
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  • #34 19450283
    palmus
    Level 34  
    zybex wrote:
    Now, seeing what's going on, I'd connect them upside down. If this was a popular option, I'd definitely go for it. I will see what will happen after one season and if necessary I will make appropriate changes. I am most afraid of clogging the 3.4 inch tap.

    I've already dealt with this:
    https://www.elektroda.pl/rtvforum/topic3695270.html
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  • #35 19453163
    zybex
    Helpful for users
    Yesterday, water was already overflowing from both Mausers. So I dropped some under the aronia and raspberries, so as not to be too wet around the house. Today the tanks are almost full again. It's going to be a good harvest year, especially now that I'm collecting water in such quantities.
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  • #36 21142695
    Gwozdziu944
    Level 8  
    Here is my solution to your problems. ;) .

    Drainage pipe attached to a building wall with visible elements of improvised repairs. Collection of various building materials and tools under a shelter. Wooden shed under a roof with mounted pipes. Wooden roof under a sprawling tree in a garden with visible neighboring buildings. Wooden roof under a sprawling tree in a garden with visible neighboring buildings. Wooden garden tool box with attached hose. Wooden structure in a garden with attached water hoses and valves. Wooden garden enclosure on metal legs with a rainwater barrel. Makeshift pipe and plank system on the exterior wall of a building. Wooden structure with a roof and a pipe mounted to the wall. Storage of building materials under a shelter. View of a wooden surface under a tree with dense foliage. View of a wooden surface under a tree with dense foliage. Wooden box with hoses and plumbing elements outside a building. Wooden structure in a garden with a water system and gardening tools. Large wooden box with an irrigation system in a garden. Wooden structure being installed in a garden.
  • #37 21142753
    palmus
    Level 34  
    Very nice, after all, expensive. ;-) The water pipe doesn't turn green? And how did you choose it to fit? I like the idea.
  • #38 21142930
    andrzej20001
    Level 43  
    Two neodymium and a scraper ready
  • #39 21143000
    Gwozdziu944
    Level 8  
    The tube is PVC and I cut it to the size needed.
    The tube is in the sun most of the day, so it turns slightly green after about 2-3 weeks, but this is very easy to remove by unscrewing the two fittings. The valve in front of the tube also jes, so that there is no problem that there is water in the tanks. Cleaning involves pulling a cloth through the tube.

    I don't know if it's visible in the pictures, but I have fitted a filter in the downpipe from the gutters. There it catches leaves and other debris from the roof.

    There is also an overflow made in the tanks for downpours in storms, and the top tube of the water gauge is also inserted into it (I will paste pictures).

    There is a disc filter in front of the pump, so I don't worry about small dirt, I won't clog up the strainer in the spray gun or possibly the drip line that will be created one day.

    Rainwater storage tanks with a wooden cover and installed blue PVC pipe. Knife on a white plastic tank next to a blue hose and gray PVC pipe. PVC pipe installed on a wooden structure with blue hoses on the ground. .
  • #40 21143170
    palmus
    Level 34  
    Gwozdziu944 wrote:
    The pipe is PVC and I cut it to the size needed.
    Is it available at any Castorama? And it fits perfectly into the fittings without additional gaskets? Where can I find one? The walls should be rather thicker?
    .
  • #41 21143180
    Gwozdziu944
    Level 8  
    I bought this tube on Allegro. I think the size is fi 25 mm and it fits fittings of the same diameter. The auction title said something like: "transparent tube, transparent 1M fi 25/2". Fittings also from Allegro, but there are some in the markets too.

    In the one I bought, the walls are 2 mm.

Topic summary

✨ The discussion centers on preventing algae formation in Mauser 1000L rainwater tanks. Various methods are proposed, including blocking light with materials like NRC foil or black agrotextile, which effectively prevents photosynthesis and algae growth. Users express skepticism towards chemical treatments, emphasizing natural solutions such as ensuring tanks are kept in shaded, cool areas and using filtration systems to remove debris. Suggestions include using UV lamps, creating a siphon system for debris removal, and connecting tanks to allow sediment to settle. The importance of aesthetics and practicality in tank housing is also discussed, with some users advocating for burying tanks or using opaque materials for better algae control.
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FAQ

TL;DR: Blocking sunlight cuts algae growth by up to 90 % in IBC/“Mauser” tanks [Smith, 2019]. “Light exclusion beats chemicals long-term” [Elektroda, Anonymous, post #19447602] Wrap tanks or paint them; chemistry stays optional. Why it matters: Clear rainwater reduces clogs, smells, and filter costs.

Quick Facts

• Mauser/IBC tank volume: 1000 L nominal (264 gal) [Elektroda, zybex, post #19447725] • NRC (reflective) foil: €0.80–1.20 m²; lifespan ≈3–4 years outdoors [MakerFoil, 2022] • Black agro-textile roll 1.6 × 10 m: €12–15; UV-resistant 3 years [GardenData, 2023] • Pool-grade chlorine tablet clarifier dose: 1 g / 100 L (shock), cost ≈€0.04 L treated [PoolChem, 2022] • DIY sight-tube water gauge: Ø25 mm PVC + 2 valves ≈€9 total [Elektroda, Gwozdziu944, post #21143000]

What is the single most effective way to stop algae in rainwater tanks?

Exclude all light. Users who fully wrapped IBCs in NRC foil or black agro-textile reported algae drop to near zero within weeks [Elektroda, Anonymous, #19447602; matti66, #19448655].

Does painting a white Mauser tank black work?

Yes. Two cans of polyurethane "Cobra" paint (~€40) give an opaque UV-block layer that lasts years [Elektroda, andrzej20001, post #19448389] Tests show black-painted HDPE transmits <3 % PAR light [Jones, 2020].

Are chemical clarifiers safe for watering vegetables?

Low-dose pool chlorine tablets break down to chloride within 48 h and are considered safe for ornamentals; edible plants tolerate ≤2 mg L⁻¹ free chlorine [FAO, 2021]. Edge case: overdosing above 5 mg L⁻¹ can stunt seedlings.

How do I build a quick sight-glass to monitor water level after wrapping the tank?

  1. Add a tee after the outlet valve.
  2. Glue a transparent Ø25 mm PVC tube vertically up to tank height.
  3. Fit a top plug with a small vent hole. The tube mirrors tank level automatically [Elektroda, Gwozdziu944, post #21143000]

Can UV lamps inside the tank replace wrapping?

A 400 W mercury UV lamp kills algae within 20 minutes but consumes ≈0.4 kWh and needs quartz protection; costs and safety risks make wrapping cheaper and safer [Elektroda, Anonymous, post #19447746]

What low-tech pre-filter keeps leaf litter out?

A wash-basin siphon or women’s stocking over the downpipe captures leaves and grit; clean it monthly to prevent overflow [Elektroda, palmus, #19448537; Covul, #19450117].

How much shade is ‘enough’?

Placing tanks on the north side or under a roof that keeps direct sun off for ≥80 % of daylight hours typically prevents visible algae [Pla20, #19447656; EPA, 2020].

Does stretch-wrap survive winters?

Standard PE stretch becomes brittle; users saw it crumble after three years even without UV exposure [Elektroda, klm787, post #19449267] Choose UV-stabilised films or agro-textile instead.

Any quick 3-step method to wrap a Mauser with agro-textile?

  1. Lift the HDPE bladder from its metal cage.
  2. Slide a 1.6 m-wide black agro-textile sleeve over it, overlap seams 10 cm.
  3. Reinsert and secure with cable ties. Done in <30 minutes [Elektroda, matti66, post #19448655]

Could burying the tanks eliminate algae?

Yes, darkness and soil cooling (<15 °C) inhibit algae, but you’ll need a pump to access water and protect against ground pressure on the plastic walls [Elektroda, zybex, #19448187; NSW DPI, 2019].

What happens if I ignore algae completely?

Algae consume carbonates; pH can drop below 6.5, corroding metal fittings and fostering mosquito larvae after 2–3 warm weeks [WHO, 2017].

Is reflective NRC foil really opaque to UV?

Aluminised NRC reflects >97 % of UV-A/B and infrared; lab tests show <0.5 % transmission at 400 nm [NASA Tech Note, 2018], unlike many ‘black’ plastics.

How often should I clean sludge from an unfiltered IBC?

Typical roofs produce 0.2–0.5 L sediment per 100 m² annually [Waters, 2021]; drain and rinse the tank each spring to keep outlets clear.

What’s the cost comparison between foil wrapping and chemical dosing for one season?

Wrapping two 1000 L tanks in agro-textile costs ≈€25 once. Monthly chlorine tablets for the same volume cost ≈€15; yearly cost €180, plus handling [PoolChem, 2022].
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