hiii , im planning to make a 600G pond , but i cant provide aireation or filtration , so how many fishes can i put in it and how is the water changes will be??

Without filtration, none. You can build your own filtration out of rubbermaid tubs or garbage cans even. The most important thing would be a pump.

The water needs a turnover rate of least once a hour and since goldies are very messy fish, the filtration really needs to be heavy duty though Trickle Towers (TT's) can be added and made simply. Strawberry Pots with kitchen scrubbies and filter pad and lava rock is one type.

I suggest you research diy projects before looking for any fish. Water Quality is highly important with fish.

600 gl's is not going to be adequate for any amount of Koi as they need 250 gl's minimum each. The size of the pond is better suited for Goldfish suc as comets, Sarrassa, Shebunkin. Allow 50 gl's each and realize they will spawn have babies.

Don't consider fancy's if your water is going to drop below 50* in the winter either, they cant tolerate the lower temps like Comets & Shebunkins & koi can. Also the pond needs to be deep enough to allow for freezing.

Water needs to be changed weekly, at least 10%, with a 50% once a month. Clean down total Spring & Fall. The water also needs tested weekly, same as a tank.

i'm planning on goldies not koi and i thought about diy projects and i can make a great filter but the problem is that the pump, i have access to only regular water pumps(not submersible) which i think will burn if i turn them on for over an hour.

also i dont know if they need aireation or not??

Haydar, if you live here in the US, you can find pretty cheap pumps at your local HomeDepot, either in the garden department (pond section) or the plumbing department. Lately we bought our pumps from there, they seem to be able to handle the koi debris so much better than some other pumps do, for a fraction of the price. They hardly ever get clogged up.
As for airation, if the outflow of your filter is strong enough, and you don't live in a very hot climate, airation isn't a must, but it is beneficial. Fish, and the living bacteria in the pond water, as well as any plants that you might wonna have, do need oxygen to thrive. There is a certain percentage of oxygen that is needed as a minimum in a pond, although I have forgotten what exact number that is.
Of course, if you live in a hot climate, like I do (Florida), then you definetely need airation. Warmer water holds less oxygen, so you have to supplement that somewhat. It doesn't have to be in form of an airpump/airstone combination though - raising the filter higher will do the same trick. Remember, the most oxygen exchange is on the water surface. So, anything that agitates the water surface will add oxygen to the pond.
Kathy, I love your idea with the strawberry pot - looks neat, and nobody sees the media inside!
CDA Pond, I have put your question into a new thread, so it gets the attention it deserves. I gave it the title "CDA Pond question"....

thanks alot tamianth for replying , and thanx Ranchugirl u've been always a great help and addition, hope ur fishes keeps thriving and getting bigger all the time , about where i live , i'm in Baghdad/Iraq and here there is no chance to get professional aquarium tools , the available things are sponge filters and small air pumps only , so i must always refer to DIY also its pretty hot here in summer and a little cold in winter so im planning on making the filter returns the water it took from the pond in a fountain form so to agitate the water surface and makes the water cold in the same time (due to speeding evaporation), i think a i talked alot hope i didnt bother...

You are no bother, Haydar... Of course, being in a foreign country, its kind of tough to find things. Hmmm, let me think.....
Any kind of hardware store? What are you using if for example your basement overflows, and you need to get water out? (If people in Iraq have basements, that is... )
Sponge filter and airpumps would work, its just that you need a lot of them for a 600 gl pond. Maybe you could find bigger sponges to add onto the sponge filter.
What materials are you planning on using for the fountain? Maybe we can work with that somewhat to turn it into a filter...

Hmmmmmmm, lets look at Gravity feed then! What do you think Andrea?

I'm not much on filtration knowledge myself, but know of a few things or tricks.

Have you got access to any lava rock Haydar ? Kitchen scrubbies, those plastic ones, don't know if you get those there though, but they work well also.

Glad we can be of some help!

That strawberry pot trickle tower is a good one. Jackie Ramo posted it up over at KV and I have recomended it a lot. A little piece of pvc capped at the ends and drilled makes a nice spray bar. Hmmmm, milk crates filled with lava rock and a pvc pipe used as a spray bar could be gravity fed also. One can alway's hide the lava rock & crates with some water loving vine....

I don't have much experience with gravity fed filtration, Kathy...
It could be possible that Haydar work on pipes going down somehow into a container that can be used as a filter. But he would still need a pump to get the filtered water back out of the container and into the pond, wouldn't he?

Lava rocks in a milk container definetely could work, good idea! Or how about a flower pot, some of those lengthwise ones? Any kind of water tight container - how you transport your milk or water, Haydar?

well sorry for being late in replying as this is the time for mid year exams...i read your letters and thought alot and reached to something may be quiet good for my case , i'll take a pump which takes water from the pond to the outside ,and pour it in a bowel filled with gravels or lava rocks which has a hole in its bottom, from this hole the filtered water will go in tubes to make a bath or fountain over the water surface , the pump in order not to over heat and burn will have a timer which will ensure it will go on for half an hour and off for a quarter(i have a freind who said that he will make to me such a timer he is an electric engineer),soooo what do you think?

posted two times ,ops!

Sounds like you have a good idea.

Wasn't there a soldier that posted on here last summer whom built a small pond in Baghdad? If not it's on another koi message board but I'd swear it was on here. Andrea do you remember? I am wondering if this soldier whom posted on here might also be able to help? I'll have to search this site for it.

Scott

Okay I found it.

http://www.kokosgoldfish.invisionzone.com/...67&#entry321167

I do remember Old Jumper, Scott - too bad he isn't around at the moment. I would have loved to hear more about his pond adventure, and especially see some pictures.
Haydar, I am sure it is doable the way you are planning it. Is there any way of telling how many gallon or litre (or whatever meaning of measurement you have) the pump processes every hour?

sorry for being so late in replying as my ISP was down , about the pump power i cant precisly determine but it takes out the pond water in 3.5 to 4.5 hours i guess ,i'll try to calculate its average power by dividing total time on the water amount and tell you later, i forgot to tell you that i digged the pond and lined it with liner and filled it with water and before a little time i completed emptying it to remove the first time water that may have toxic materials from the liner