Posted: Mon Feb 05, 2018 6:56 pm Post subject: Let's talk about nutrients in water.
Is there anyone in this forum who has run comprehensive tests on a) Metro water b) Bore water. Share the results in terms of general hardness, carbonate hardness, pH, nitrates, nitrites, ammonia, phosphates, calcium, magnesium, trace elements, toxic elements etc.
My house in Chennai is just 2 kilometers from the ocean. Bore water could almost be used for a salt water aquarium. TDS reads 400 PPM. Metro water is around 250 PPM TDS. I understand that these things vary significantly between different areas and different metro water units which process these waters from different sources. However, just a ballpark figure and how (why) successful you have been in creating a planted aquarium with this water would be useful.
Posted: Fri Feb 09, 2018 3:56 am Post subject: Re: Let's talk about nutrients in water.
Although I do not currently live in Chennai, I can share some experience. Firstly TDS can be either due to salinity or due to GH+KH+other disolved elements. My house in Chennai is around 16kms from the Ocean and the well water has a TDS of around 350-400. Bore water in the same area has 1.5-2x times this TDS.
In Hyderabad (where I currently live) I can share some of my experiments.
1. RO water will kill plants.
2. The best success I've had with a 10G low tech planted tank with shrimp and guppies is a TDS around 200-250 (mix of bore and RO water) (monthly water changes), with a KH ~6.
3. With a 40G high tech tank though, I maintain a TDS of 130-150 (before dosing ferts), weekly water changes of 30-40% KH ~2. I've never bothered measuring GH since bore water would contain significant amounts of calcium and magnesium.
Posted: Sat Feb 10, 2018 8:21 am Post subject: Re: Let's talk about nutrients in water.
That's an interesting lot of information Anand. The fact that bore water contains calcium and magnesium is exactly what I wanted to hear. I cannot have a heavy dosage regime as yours as maintenance is outsourced to my poor mom. A small 2 feet by 1 feet walstad tank, with mud and gravel cover. Around 1/30 of what you would dose and 50 percent change every month. Utter easy plants like sag, sword, hornwort, wisteria etc. I am planning to use metro water which I treat for chlorine and chloramine. Around 250 ppm as we agree. The thing is these guys remove all the nutrients. Bore water is too hard. Mixing things is complicated for me in the long run. Any thoughts?
Posted: Mon Feb 12, 2018 5:37 am Post subject: Re: Let's talk about nutrients in water.
With my low tech tank I did not do any dosing except for occasional dosage of Seachem's pottasium. I only monitored the TDS. Just keep TDS down to around 250. If not heavily planted, then keep a pothos plant growing either out of your aquarium or out of your HOB to control nitrate levels. You should be able to handle bimonthly water changes so long as you top of the aquarium with RO water. You can use Vallisneria, which love carbonates. Just control lighting in your low tech tank or you could end up with BBA which love organics (if you don't do regular water changes)
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