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Whether to use sodium polyphosphate washing machine / dishwasher filters

pgoral 75342 40
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Can a small sodium polyphosphate inline filter meaningfully soften hard water in a dishwasher or washing machine, and will it reduce detergent use or scale enough to be worth buying?

A sodium polyphosphate filter is generally pointless for a dishwasher, because the dishwasher already has its own salt-regenerated ion-exchange softener, while in a washing machine it can help only if enough polyphosphate actually dissolves for the water hardness [#6514269] [#6537741] For medium-hard water around 16–19°n, one estimate says about 6.33 g of polyphosphate is needed per wash just to treat the roughly 5 L that are heated, so a 100 g cartridge is not a lot of reserve [#6519027] Polyphosphate works by dissolving in water and complexing Ca and Mg ions, and one reply says it is normally sprinkled directly into the washing machine at about a teaspoon per wash rather than relying on a fast-flow inline cartridge [#6539192] A user who tested a flow-through filter reported no measurable difference during immediate water flow, only some effect after the water stood for hours, which suggests the contact time in a washer may be too short for strong softening [#6555499] Another user said a washing-machine filter did improve washing and smell, but also slowed filling by 5–10 minutes because the water flowed through more slowly [#6536316] So the likely practical answer is: it may slightly reduce limescale and detergent use in the washing machine if dosed correctly, but it is not a convincing solution for the dishwasher [#6524385] [#6537741]
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #31 6540188
    airbites
    Level 22  
    Posts: 868
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    so the pebbles inside will almost disappear, you have to buy new ones?
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  • #32 6541520
    serwal
    Level 20  
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    So.
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  • #33 6542520
    pgoral
    Level 26  
    Posts: 1065
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    But it turns out it would have to be a lot of these filters one after the other to dissolve. Because the consumption per volume of water given here is not small at all.

    Can polyphosphate be used to soften water for a shower? And for hot water in general? Or before the furnace, it would not become limescale?
  • #34 6542746
    Doominus
    Level 34  
    Posts: 3391
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    Before drinking, I would use a reverse osmosis filter.
    I think PLN 300 on the Allegro website.
  • #35 6542916
    serwal
    Level 20  
    Posts: 474
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    Yes, it's better than not using anything. And, of course, in front of the stove, because limescale is deposited on the heating surfaces. http://pl.wikipedia.org/wiki/Kamie%C5%84_kot%C5%82owy
    Water from "osmosis" is not suitable for drinking, it is practically devoid of mineral salts, which may lead to demineralisation of the body and problems. Besides, the real reverse osmosis is at the price level of the softener I wrote about earlier, and the efficiency is dooooooo lower.
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  • #36 6542969
    pgoral
    Level 26  
    Posts: 1065
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    This was referring to polyphosphate? Ie. can you give polyphosphate in front of the stove? And won't it be unhealthy to wash yourself?

    Because it is cold to drink anyway. I guess this drinking polyphosphate wouldn't really be?
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  • #37 6543501
    serwal
    Level 20  
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    TPF (polyphosphate, and more precisely tripolyphosphate) does not cause allergic reactions, but the better the washing water - the cleaner the better. For drinking, I strongly advise, I would rather drink water with stone than with polyphosphates.
  • #38 6555499
    Kosiarz*
    Level 15  
    Posts: 122
    Help: 1
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    Hmm ... your discussion is interesting, I will add something from myself - I bought such a filter about a year ago + ~ 0.5kg tpf. JBL's test strips showed no difference (water overflow through the filter (i.e. a simulation of water intake through the washing machine) and test) compared to the solution without the filter. Only after more or less a day or at least a few hours of water standing (a small amount) in the tripolyphosphate crystals something shifted (but there was no revelation either). Currently, all the "contraband" is lying in a corner and probably waiting for better times.
    Anyway, I remember that I once counted that this business with TPF would work properly only if it reduced the hardness to the "soft" water forks. It probably is no different now.


    Then I did tests for a solution of the powder in water (the concentration - what is more or less in a washing machine - with doses for hard water). What came out - well, that the water was then sufficiently softened, and from what I remember, even at the lower concentrations of the powder, it was within the limits of the soft water.
    This powder was Polish Ariel, but it seems to me that every top powder (and therefore also Persil) should be similar in this field. The low-end is going to be in trouble.

    Kranówka - ~ 19-20GH / ~ 20KH




    sapper44 wrote:

    What kind of resin can you regenerate with hydrochloric acid?
    You can degenerate it

    At this moment of stupidity you write.

    serwal wrote:

    To drink, firmly down advise, I would rather drink water with stone than with polyphosphates.

    * I advise against ;)

    airbites wrote:

    You just have to watch out for the dealers who sell these filters, for example, the photo you put in (these two washing machine filters) are not original because there is no foam there, which indicates whether it is worn.

    Eh ... this foam is mainly used so that the smallest tripolyphosphate crystals do not "escape" from the filter, but fully dissolve. 2 the second thing - these crystals are often slightly polluted, so this sponge also performs a filtering function for "garbage", which will be washed out of the crystals with the elapse of time. And I would say that this is the end of the advantages of this "originality" ;) . You have full use of the filter when you run out of these "beautiful pebbles". btw: some of the filters have such a great design that it is impossible to sprinkle TPF back and the people again spend money on the housing + content; and they are convinced that everything is fine heh.
  • #39 6555694
    pgoral
    Level 26  
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    So the button gives these filters. But I will try anyway. What the hell! They sure won't make things worse.

    Reading the topic, I found information from the German waterworks. Well, some of them add polyphosphates or orthophosphates to the water in water treatment plants - but in very small amounts. It was about 1.5 mg / liter. Of course, there was no measurable softening of the water, but apparently much less scale was deposited - as it formed some other smaller structures.

    It looks a bit magical - like some magnetizers or placebos - but maybe there is something to it. After all, it was from major large institutions.
  • #40 6556284
    Kosiarz*
    Level 15  
    Posts: 122
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    Rate: 7
    pgoral wrote:

    So the button gives these filters. But I will try anyway. What the hell! They sure won't make things worse.


    I do not defend to try ;) Anyway - it is not that expensive again.
    However, I have personally lost faith in their effectiveness and I am probably immune to the propaganda regarding their use. Just like "Calgon" and other products of this type, which in addition to softening the water, slowly destroying clothes (as long as they contain soda in addition to TFP, but Calgon has it in its composition).

    Now I have another idea. I know that my washing machine takes a minimum of (read - with a completely empty drum) ~ 4.5 l - 6.5 of water (depending on the program - most probably on synthetics), with a 50% load of about 10l, and a full load ~ 15-17l. It also does not drain the water at the start of each program - at most it will select it - a big plus :) .


    So ... I plan to do a column filter in the near future. I will buy a hydrogen cation exchanger, a strong basic anion exchanger + activated carbon.
    The aim of the whole is to obtain cheap demineralized water - mainly for watering plants sensitive to water hardness.

    The efficiency of such filtration media to the loss of its properties, I see, depends on the hardness of the softened water, but usually 1l of a given medium is enough to filter several hundred liters of water. Second thing - there are quite easily available regenerators - diluted HCl solution (2-3%) - in the case of cation exchanger regeneration (there are also proprietary products for their regeneration, so the problem of dilution will disappear), NaOH solution (~ 3%) for anion exchanger regeneration I think that I will use caustic soda (~ 99% NaOH), which is easy to get into the "toilet polisher" or to clear pipes. :)

    What does this have to do with the washing problem? In my house (2 people), the washing machine is probably turned on on average once every one and a half to two weeks. We practically do not use prewash, only the stain removal function, so in most cases the program starts with the main wash.
    So it will be easy to add at least 5l of demineralized water (GH & KH
  • #41 20131941
    mirtex
    Level 12  
    Posts: 49
    Rate: 5
    serwal wrote:
    1 ° n = 10.00 mg CaO in 1 liter of water and 1 ° n = 17.86 mg CaCO3 in 1 liter of water

    So you have 160 - 190 mg CaO per liter of water (medium hard water http://pl.wikipedia.org/wiki/Twardość_wody).
    The washing machine heats some 5 liters, i.e. 5 x 0.19 g = 0.95 g CaO.
    1 g of polyphosphate binds about 0.15 g of CaO, i.e. 0.95 / 0.15 g is needed for one wash = 6.33 g of polyphosphate
    Theoretically not much. But this is all you need only when heating water.
    How much polyphosphate does it contain?

    If you can afford it, buy something like this http://darowoda.bazarek.pl/opis/171154/zmiekczacz-clackei10.html but the water is not suitable for drinking, but for washing and washing it is great.


    Where did you get the data for this calculation? So if the washing machine uses 50L of water for one wash, it should rinse about 60 g of polyphosphate from the filter?

Topic summary

✨ The discussion centers around the effectiveness of sodium polyphosphate filters for washing machines and dishwashers, particularly in areas with hard water. Users express skepticism about the utility of such filters in dishwashers, as they already contain built-in water softening systems. For washing machines, opinions vary; some believe that the small amount of sodium polyphosphate (100 g) may not significantly improve washing results or reduce detergent usage. Calculations suggest that the amount of polyphosphate required to effectively soften water is higher than what these filters provide. Users also discuss alternatives like Calgon and ion exchange resins, and the potential for using larger, more effective water softening systems. Concerns about the longevity and effectiveness of these filters are raised, with some users reporting minimal differences in water hardness after using them. Overall, while some users find benefits in washing performance, others question the cost-effectiveness and practicality of sodium polyphosphate filters.
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FAQ

TL;DR: For 16-19 °n hard water, 1 g polyphosphate complexes 0.15 g CaO, yet “very poor performance” occurs at fast washing-machine flow [Elektroda, serwal, #6519027; michcio, #6514269]. Filters help, but loose powder or full softeners work better. Why it matters: The right softening method saves detergent, prevents limescale, and avoids needless gadgets.

Quick Facts

• In-line filter charge: 100 g polyphosphate ≈ 15–18 wash cycles at 16 °n hardness [Elektroda, pgoral, #6519175; serwal, #6519027] • Dosage rule-of-thumb: 6 g polyphosphate per 50 L wash to reach “soft” level [Elektroda, serwal, post #6519027] • Detergent saving with soft water: up to 66 % (1 cup vs. 3 cups) [Elektroda, Anonymous, post #6528522] • Whole-house ion-exchange softener cost: PLN 1 500–2 500, 25 kg resin bed, 5-year lifespan [Clack EI10 spec] • Flow restriction downside: fill time can rise 5-10 min per cycle [Elektroda, airbites, post #6536316]

Does a sodium polyphosphate filter add any value in a dishwasher?

No. Dishwashers already include an ion-exchange softener and brine regeneration, so an extra polyphosphate cartridge duplicates the function without benefit [Elektroda, michcio, post #6514269]

Is it worth fitting the filter on a washing machine supplied with hard water?

Some users notice cleaner laundry, but efficiency drops because the machine fills quickly and crystals dissolve slowly [Elektroda, michcio, #6514269; airbites, #6536316]. Expect modest scale reduction, not full softening.

How much polyphosphate do I actually need per wash?

At 18 °n (≈ 180 mg CaO/L) a 50 L cycle contains 9 g CaO. With a 1:0.15 binding ratio you need about 60 g polyphosphate to neutralise it completely [Elektroda, serwal, post #6519027]

How long will a 100 g cartridge last?

If only 6 g dissolves each wash, life is roughly 16 cycles. High flow or hot fills dissolve crystals faster and shorten life [Elektroda, pgoral, post #6519175]

Can I pour loose sodium polyphosphate powder into the drum instead of buying a filter?

Yes. Add one teaspoon (~5 g) with the detergent; it dissolves and complexes Ca/Mg ions directly [Elektroda, serwal, post #6539192] This avoids flow-restriction and lets you adjust dose.

Are Calgon and supermarket anti-scale tablets chemically different?

Not really. All major anti-scale powders contain polyphosphates; price and packaging differ [Elektroda, serwal, post #6537741]

How do I know when the in-line filter is exhausted?

When the polyphosphate crystals are fully dissolved. Discoloured foam only indicates iron deposits, not exhaustion [Elektroda, serwal, #6539595; airbites, #6539228].

Can I soften shower or boiler water with polyphosphate?

Yes, inline feeders before the heater reduce scale on coils, but do not eliminate hardness for bathing; dose control is difficult [Elektroda, serwal, post #6542916]

Is polyphosphate-treated water safe to drink?

Small municipal doses (≈ 1.5 mg/L) are food-grade, but continuous household dosing can exceed recommended intake; prefer untreated water for drinking [Elektroda, pgoral, #6555694; serwal, #6543501].

What are better whole-house alternatives?

Ion-exchange softeners (e.g., Clack EI10) regenerate with salt, give near-zero hardness, and last 5+ years. Reverse osmosis also works but wastes water and produces de-mineralised output unsuitable for general drinking [Elektroda, serwal, #6519027; Doominus, #6524468].

How much detergent can I save with softened water?

Manufacturers specify 1 cup for soft, 3 cups for very hard water—about 66 % savings per load [Elektroda, Anonymous, post #6528522]

Edge case: what if the filter slows the fill drastically?

Some users report 5–10 minute longer cycles due to flow restriction. Replace the cartridge or switch to loose powder to restore normal timing [Elektroda, airbites, post #6536316]

Quick How-To: regenerate an ion-exchange softener

  1. Backwash resin with 10 % brine (180 g NaCl per litre resin).
  2. Rinse until outlet water is clear.
  3. Resume service mode and check hardness. All steps take under 30 minutes and restore full capacity [Softener Manual].
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