View Full Version : Can I use old Sand?

01/21/2010, 05:43 PM
Hey guys about 3-4 months ago I switched over from a 70 gallon to a 150. I am wanting to switch back over to the 70 gallon. I have some of the old sand still in the 70 gallon. It is all dried up now. Could I reuse this sand?

Thanks alot,


Grandreef 2
01/21/2010, 06:17 PM
I'm not an expert on this but you could do it then just add some bacteria to the water like dr tims one and only reef pure.

01/21/2010, 06:38 PM
i dont know for sure but i have allways read not to use your old sand it hold alot of crap in it, just my 2 cents but here is a bump im sure other more experienced rc members will chime in on this

01/21/2010, 06:52 PM
The problem with using old sand is that while in use it absorbs P04 and N03 and even when its dried for years and then re-used, it leaches those back into your new tank. Although I haven't done it, you can neutralize it with a short bath in muriatic acid. But you have to be extremely careful with that stuff.

Personally it's not worth it, I would buy new sand and start fresh.

01/21/2010, 06:55 PM
I would just buy new sand as well, but you could probably get away with just rinsing out very well. If it isn't anything special, just toss it and get new stuff.

01/21/2010, 06:58 PM
Yeah sounds good. The sand looks pearly white and tempting to use, but I wanted to be sure though. I kinda figured it could not have been good.

What do you guys think about barebottom. I have been wanting to due that for so long,but I hear so many mixed reviews. Is the tank harder to keep up without sand?

01/21/2010, 07:11 PM
I have use old sand over and never had any problems. Just rinse it realy good.

01/21/2010, 07:12 PM
Just rinse it really well. It should be fine. Put it in a bucket or other large container, stick a hose down to the bottom of the sand and run it for a while. The gunk will come up and overflow out of the bucket. Stir it around really well and repeat. Itll probably end up cleaner than most sand you can buy.

01/21/2010, 07:22 PM
Toss it and buy your sand by bulk at a concrete supplier or stone center 15 bucks a ton.

01/21/2010, 08:39 PM
I heard that using the sand from the concrete distributers were not so good to use.

01/21/2010, 09:41 PM
My vote is the rinse it side. I know people who have seriously old sand still in use and plenty that started with dry, once wet, sand. swish it around in a lot of water in a bucket until it is clean and go for it.

01/21/2010, 09:52 PM
If you made a similar switch only 3-4 months ago and had no problems, then you should be fine. I wouldn't think the past 3-4 months of accumulation would be a huge deal especially if you rinse it off.