Domestic Water Tanks: The Tech Guy – Dr Al


Note from the Editor:
This article was kindly written for the SDC by member @Doctor Alan.

Rural tanks:
We lived in WA for about twenty years before moving to Brisbane in 2015. Always having a yen for our ‘5 acres by the sea’, we eventually realised that was a ‘bridge too far’ – we simply couldn’t afford it. We compromised and found 5 acres in Dandaragan, with the sales sign reading: ‘SECWA to boundary’. Later, we found that this meant that we would get electricity to the boundary of our property – single phase, 32 amps, as soon as a transformer was set up, the cost of which would be borne by all its users on a shared basis. We would have to buy a water tank, and that would be our only source of water. The tank was around 100,000 litres, and would catch all the rainwater from the house, shed and carports. We never had any trouble with running out, but were secure in the knowledge we could always get a tanker to top it up if necessary. The big advantage of this arrangement was, of course, that we didn’t have to pay water rates.



At this point, I really wish there had been some handbook or other that would have given us the low-down on living in the country – perhaps that’s another article I should write.

For instance, not everybody knows how a septic tank works or that a pump attached to the water tank detects a slight drop in pressure of the outlet and the pump starts automatically, so you have as much pressure as a home in the suburbs, or thereabouts.


shutterstock_2415042599 (1).jpg
Do you have a water tank? Image Credit: Shutterstock



Our next home was in Gingin – a bit closer to Perth – and we splashed out for a larger tank – about 170,000 litres. We had a free-standing games room, a huge shed, a large carport, and a shaded patio area, all of which contributed to the water supply for the tank. Once again, we had absolutely no worries about running out of water – and it was all free! I’d researched pumps quite well and found that the Grundfos brand was worth paying the extra for. We had excellent pressure throughout the house, including the top floor.



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A few years ago we built a house on a sloping block. In the build we had to option of having a “room” under the house which was accessible from the garage. We made use of this room by installing a couple of 250litre water barrels. The outlet from the washing machine was diverted into these barrels. Inside one barrel was a submerged water pump with a float switch. The pump would then send that water up to the top of the block into another barrel from where a vast drip system would keep the garden watered throughout the day. The biggest challenge was the amount of lint that the washing machine took out of the clothes and was deposited into the storage barrels. It became a problem when the drip system clogged up every day. Over a few weeks the introduction of a muslin filter on entering the first barrel took out a vast amount of the lint. A further (finer) filter after the pump was required which prevented it arriving in the top barrel. As long as the weekly routine of cleaning out the filters (no more than a 10 minute job) and also opening the end of each drip line to flush out even more lint (another 10 minutes) the system ran successfully for 5 years. Not a cent was spent on fresh water used on the garden and we had many compliments from the neighbours about how green our garden was even through the hot summer. The total cost of the system was about $400 ( pump, pipe work and an in line filter). The barrels were re claimed from chemicals delivered to a local dye house. It is important to note that all the grey water was used up within a few hours so there was never any stored to become “black” water.
 
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I have a top loading washing machine which has 10 water levels. We had a special tap we used to fill our washing machine with rainwater for washing or rinsing. Our washing machine had a pump in it which meant we could put the hose that the rinse water went out through and pump it back into our washing machine and use for washing the next load. I didn't buy a front loading washing machine as you have to bend over to fill and empty clothes out of it. The filters in your washing machine should catch most of the lint provided you remove the lint after every load or wash day. Our rainwater also went into the kitchen sink via an extra tap. Depending what soap / body wash you use friends of ours used to catch some of their shower water in a bucket and use it on their garden
 
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