some thoughts from Dozer
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water jar

contributor Robin T

image cementjar3.jpgI attach some details on the water jar used for rainwater harvesting. They cost around 600baht be sure to get one with a built in 3/4inch drain plug at the bottom, don’t forget the aluminum lid (100baht)

make sure your dig a 50cm hole to place the jar below grade on a tamped down bar of sand. If the base is not sound then the water pressure with break open the jar. Arrange the jars to be connected together by the drain cock. Also run a vertical piece of 3/4 clear plastic tubing supported on a vertical stanchion. This will give you a level indication and also some overflow protection.

If anyone wants mores details on rainwater harvesting I can provide notes on gutters and drain pipes. As a rule, water jars should be drained towards the end of the dry season once a years and cleaned out thoroughly with plain detergent powder and rinsed. You can also spray the insides with Haiter bleach. Warning, don’t get inside while using bleach, you will suffocate from chlorine. Its good safety practice to have someone else standing by when ever a person gets into a closed space like a jar. There is always the risk of suffocation and fainting.

BTW, I have been drinking rainwater for 5 years now and I am still bald.
For children, they should have some form of calcium supplement (plain fresh milk is usually sufficient). I have seen an article about using ground up clam shells ( hoy lai – NOT hoy daeng). These can be put into the jars, about a kg per jar. I would boil them first. that will help the water to absorb calcium slowly, don’t know how effective it is? Still researching the subject, Also Iodine deficiency can be a problem

People have been harvesting rain water for a long time up country, no known health problems. The water stays surprisingly pure and clean all year round. If you are worried about it, tip a bottle of Haiter in at the end of the rainy season. I’ve never bothered.

BTW, when placing your jars, put them at least 6 meters away from any septic tanks and make sure no undue surface water drains into the jar pits. The cement is porous and will keep the water 10 deg cooler than ambient.

editor: rain water harvesting is big around here. I still drink bottled water, but will need to give rainwater a try. I just worry about the pollutants in the water.

1 Comment

  1. Hi D

    What kind of pollutants are in rainwater? You can get leaves collecting in gutters, they should be cleaned once a year, not normally a problem, but you dont want them rotting in your water jar. especially if you add bleach – get some nasty tasting chemicals resulting. I am amazed how clean a water jar stays throughout the year and is likely to be far less risky than a shallow well for example. Where do you think your bottled water comes from? I mean the 5 gallon flagons you have delivered for 20 baht. There used to be a filter plant in the notorious soi yodask that simple used local tap water and passed it through a cheap filter (maybe) and UV light source. I think its moved from there now

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