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What is the KH though? No you should not have to remineralise it, since the GH in your tank is already high. Don't mix this 0 GH water with tap water.

You can (and should if you can) remove the old water all in one go, that won't alter the parameters, it just depends on whether taking out half the water will affect the filter system or heater etc. It is only when adding the new water that it must be done slowly. The zerowater may look a bit dearwr but the filter is more than 5 times the size so will last longer.You won't need the GH/KH+ at the start, until you get the parameters to the level you want. Once you get to that stage, as the remineralser is prebalanced tds/gh/kh ideal for the shrimp, so you will only need to use the tds meter when mixing the new water, and occassionaly test gh and kh. The zerowater does take a long time ti filter as the filter is so big, so is only really suited to small(ish) aquariums! I have my fingers crossed the remaining shrimp are super strong ans survive.

Thank you, im going to slowly remove some of the water from the tank this evening, and drip back in the filtered water once again. i think im going to invest in a zerowater filter, although more expensive than some other methods it seems to be a bit easier. ill have a look at some remineraliser for the water when i get the zerowater jug. thanks so much for the advice on different filters and correct levels, its really helping me learn a lot about keeping shrimp. Still all alive today, fingers crossed for them, im determined to get this right 😊

Those gh and kh are much better. I would retest the gh though as I wouldn't expect 0 from a brita filter, especially if you still have kh4? As you noted, the new water (brita filtered only - NO remineraliser ) will dilute the tank, so with a 50% water change you should get around GH6-7 (if the gh of the filteredwater is 0) and kh 5! The new water will need to be added very slowly so as to let the shrimp slowly adapt to it. You can refilter the water again and that may reduce the figures more. It may also be a good idea to know where you are starting from by testing your Tap water! All filter jugs have a limit in how much they can absorb and so the higher the water parameters are for the tap water the shorter the lifespan of the filter, and brita filters are quite small to start with. Its good to hear you still have 7 left. Just to be clear, you don't need RO water AND the zerowater jug, the filtered tapwater will be RO (equivalent) water! You can see on the website etc www.zerowater.co.uk Don't order/get any remineraiser yet until you have decided how you are going to go forward as if the brita water is gh0 and kh4 then you will only need GH+ (though I don't think the gh0 is right ???), whereas with RO water you will need GH/KH+. www.pro-shrimp.co.uk are who I use for shrimp stuff and they are very reliable/helpful.

The KH of the new water is 4

Thanks for the welcome to the forum, and all the useful information. unfortunately i could not get my hands on a zerowater jug right away, but we do have a brita jug in the house, so today i tested the GH of that water, which came to 0? if i introduce this water to the tank with the high GH, do i still have to re mineralise it, or does adding the 0 GH water dilute the minerals already present. So part 0GH and part Tap water. but im definitely going to look in to RO water and zerowater jugs, just seeing this as a temp fix while i work on that 🤔 yes im hoping i have a hardy few left in the tank as well… 🤞🏼 still seeing 7 alive at the moment