limited water changes... next step, overkill

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Magnum Man

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so I have been criticized for not changing enough water, and with my set up, I could easily change much more water, except for one thing... I have a "normal" sized RO unit, that I'm literally pumping dry every day, with plant use, evaporation, and water changes... because I'll need more water daily for my current set up, and I have 2-30 gallon tanks left to get running in my group, and that big 250 gallon going into my living room upstairs, I've decided to replace my "normal" sized RO unit for commercial size 500 gallon per day unit... once installed, I'll be pumping water in, and out, rather than slupping buckets... I already pump water in, but use buckets to keep track of how much I'm pulling out, to make sure I can spread it around... now I'll be using the gauge lines on my holding tank to confirm water change levels, that will likely be set around the filter draw tube lengths, so I don't have to restart filters, but could be done a couple times a week easily enough, if I decide 15 gallons per tank is not enough ( about the amount of gallons I can pull out of the tank before exposing the draw tubes... of coarse if they were all Tidal brand filters ( those would restart flow themselves, even doing a 90% water change ) but I still have a couple Aquaclears, and some 30 year old hang on backs, that would not restart, if the water level was dropped below the draw tube... but those could also be changed out, if I routinely wanted to do a bigger water change...

better to shut off the water, when the holding tank is full, rather than always having an empty holding tank...
 
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If I had not been pumping water both in and out of tanks for years I would never have survived. I have a lot of hoses and pumps and they very on length and flow rates. My need was because I have tanks in two buildings and 4-5 different rooms. So it has not been possible to automate things.

But the one thing I have been dedicated to doing is working with my tap without alteration as much as possible. I had only one tank where I changed the parameters. I sold the fish and the tank recently and I barely use mu RO/DI unit any more. These days I am using it mostly to make water for my brother to use in his humidifiers.
 
I have "rock hard" water here... I could keep rift lake cichlids in my tap water
 
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So, RO filters are tricky business... this is the RO filter I was 1st considering...

reading reviews can be challenging, dealing with experts to novices... so I mostly scan over those... but I think I gleaned from the thorough reading, that the RO membrane filter is rated at 500 gallons per day ( which is actually bigger than I need ), but the rest of the filters, lines, & pump, aren't rated for anywhere near 500 gallons per day...

so, as I'm still researching... I'm thinking this one, that tandem runs 3-100 gallon per day membranes & double sized prefilters seems better for me right now...

even though these are listed as tankless, I'll be hooking up to my 100 gallon holding tank ( non pressurized ) to fill with continuous flow... at least the 2nd one, is listed at 300 gallons per day maximum... the 1st RO filter listed here, even from the manufacturer does not list a maximum flow, only that the membrane is rated at 500 gallons per day...

anyone knowledgeable about RO units??? thoughts
 

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