Water transport

So this post is rather mundane but has occupied quite a bit of my thoughts as it's a significant challenge. The tank will have abut 700 l of water. To the keep the water quality high I'll need to be 10-20% water changes per week. That's 75-150 litres, which is a lot of water to have slopping around - apart from anything that much weighs 150kg. Ideally the whole system would plumbed in. But I can't really do that at the moment because the site of the HMA filter is some distance from the tank. As a consequence I'm going to have to collect the water then move the water to the tank so I can make the change. I COULD do it with multiple bucket trips but that sounds like a chore that quickly become wearing - I'm looking to minimise the amount of effort the maintenance takes, apart from anything I don't have that much spare time. So the plan is to collect the water in a big bucket - I'll probably use a plastic loft cold water tank. The tank will be on a heavy duty trolley which I can wheel through to the tank and make the change. I've found a trolley on eBay which looks good and another website to supply the tank - cool. But that's not the end of the story as what goes in must come out. I could have another bucket on another trolley etc etc, but that's starting to sound like too many buckets. As it happens I got lucky with the position of the tank. At the base of the tank, in the outside wall of the house is an air vent that leads direct to the outside world. The tank is designed with an overflow pipe at the final water level so that if extra water is added it tops up the tank and water flows out of the overflow, down the pipe, through a hole drilled through the vent and out to waste. So all I have to do is collect my 100 litres of purified water, wheel it through, slowly pump it into the tank, and when all the fresh water has been pumped in, wheel away the empty bucket and it's trolley and put it all away till next time. This SHOULD be really very easy, and ultimately I might do everything from the outside i.e. collect the water outside, wheel round the outside of the house to the vent, and set the pump going. I could collect the waste for re-use on the garden maybe. So that's how I'll make the water changes. Tomorrow is the visit to Devotedly-discus to check out the fish and get the filter - a significant step forward.