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Old 12-21-2005, 11:27 AM   #1
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water changes

In a 75g fish only, how often should I do a water change, and how much do I change? Do I do a full water chemical analysis on every change?
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Old 12-21-2005, 11:34 AM   #2
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there will be allot of debate on that one, but twice a month should be average. everyone kind of works out a schedual as they go, depending on there day off and so forth. it's a good idea to test water often, just to make sure. you will get the hang of things.

you sure are pretty far north aren't you? it's 22 deg in cleveland now, can't imagine how cold it is by you.

Tim.
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Old 12-21-2005, 11:48 AM   #3
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Actually kind of warm here today -2 (celsius).
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Old 12-21-2005, 11:49 AM   #4
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I do PWC's on my tanks ever other week. Sometimes depending on the test results I may do one weekly. I just keep an eye on my test results. HTH
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Old 12-21-2005, 12:07 PM   #5
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What percent of my tank should I change?
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Old 12-21-2005, 12:14 PM   #6
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What does GPD mean when dealing with RO/DI units?
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Old 12-21-2005, 12:26 PM   #7
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I would change between 10% and 15% which for you would be around 7.5-11 gallons.

GPD = Gallons Per Day. That is how much water you will be able to produce daily from your unit.

tripper
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Old 12-21-2005, 12:34 PM   #8
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so if 15% is around 11 gal, I am assuming I would need to collect the water over the course of a day. Is there a way to find out how long it would take to fill the bucket, and what is the best set-up for collection?
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Old 12-21-2005, 02:04 PM   #9
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the GPD rating on the OR/DI unit is under ideal conditions (temperature and pressure of the supply water). if you have cold water the ro/di will run slower. if the water is extremely hot, you can damage or destroy the ro/di filters. low line pressure will obviously result in slower production of water. so, the only real way to see how long it takes to fill a certain size container is to actually fill it.

on another note, you should make your new saltwater at least 1 day ahead of time to allow the salt to fully disolve, the temperature to come up to match the tank temp, and the water to "age". simply use a powerhead and a heater in the container that you use to prepare you water.

~mike
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Old 12-21-2005, 02:11 PM   #10
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Quote:
Originally Posted by LittleParr
so if 15% is around 11 gal, I am assuming I would need to collect the water over the course of a day. Is there a way to find out how long it would take to fill the bucket, and what is the best set-up for collection?
If you have a 110 GPD filter unit it will produce 11 gal in about 2 hours. A lot of the RO\DI units have external tanks which hold about 3 gal at a time making it easier to collect.

You can make the water days or weeks in advance. Just make sure it's properly aerated/heated before adding to the tank and keep a lid on it.
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