Water is the life of fish, and raising fish is raising water. Every friend who breeds colorful colors knows how important the quality of water quality is to the breeding of colorful colors. The chlorine, calcium, magnesium and other metal ions contained in tap water, the concentration of ammonia, nitrogen and nitrite in the fish tank water, and the change of PH, these unfavorable factors will affect the healthy growth and reproduction of the colorful, the most economical solution to these unfavorable factors. , The easiest and most effective way is to change the water. What kind of water to replace? Generally, friends who raise colors have their own methods of raising water. The following set of devices is made by me to raise water, which is extremely beneficial to colorful breeding, colorful reproduction and fish tank water changes. For aquarists reference.

One: Production materials

PVC plastic pipe, PVC plastic plate, rubber sheet, nylon filter, biochemical cotton, activated carbon, cation resin, anion resin, salt, hydrochloric acid, hydroxide sodium.

   1: Select a pvc plastic pipe with a diameter of 200mm, and cut three sections with a length of 400mm; six sections with a length of 50mm (drill a hole with a diameter of 15mm on each side ).

2: Select a pvc plastic plate with a thickness of 10mm, and process six flanges and six stencils according to the diameter of the plastic pipe above (the stencil is evenly drilled with holes with a diameter of 6mm).

3: Use six sections of pvc plastic pipes with a diameter of 15mm and a length of 50mm (used for the connection of the inlet and outlet).

4: Solder the prepared components with plastic.

5: Prepare a rubber plate with a thickness of 5mm and a 200-mesh nylon filter screen. According to the size of the flange, prepare six flanges, six filter screens, and stainless steel bolts and nuts.

6: Use after cleaning and disinfection.

Three: Loading of activated carbon

1: Go to the chemical reagent store to buy 5kg of granular activated carbon with a diameter of 3-5mm.

2: Wash the activated carbon in water until the water is clear and transparent. Sieve while washing (to remove too small particles).

3: Put the cleaned and sieved activated carbon into the plastic cylinder, and place the gasket, nylon filter and biochemical cotton (which acts as a buffer to prevent the resin from blocking the filter). Then tighten the upper and lower flanges with stainless steel bolts and nuts. Then wash it with water again until there is no black liquid flowing out at all, and the water is clear and transparent.

4: The role of activated carbon: remove chlorine, residual pesticides, heavy metal ions in tap water and prevent oxidation of cationic resin. (The main reason for the oxidation of cation resin is due to oxidants in tap water. Such as: free chlorine, nitrate, etc. Heavy metal ions in water can play a catalytic role. When the temperature is high, the resin is more seriously eroded by oxidants, and the result is resin exchange. The group is degraded and the exchange resin skeleton is broken, the color of the resin becomes light and the volume increases, and the exchange capacity is lost. Activated carbon dechlorination is a simple, economical and effective method.)   Four: cation resin Loading

1: Purchased from a chemical store, model 001×7 (type 732) gel-type strongly acidic styrene-based cation exchange resin 5kg.

2: Pretreatment (transformation) of cationic resin

The first step: use 10-20% brine (coarse salt), which is approximately equal to the volume of the resin to be treated Soak the resin in salt solution for 18-20 hours, then drain off the brine, rinse with clean water, so that the discharged water is not yellow.

The second step: use 2%-4% sodium hydroxide (analytical grade) solution, the same amount as above, soak in it for 2-4 hours, then drain the lye and rinse with water Resin until the drained water is nearly neutral.

The third step: use 5% hydrochloric acid (analytical grade) solution, the amount is the same as above, soak for 4-8 hours, then drain the acid solution, rinse with water until neutral.

3: Put the treated cationic resin into the plastic cylinder, place the gasket, nylon filter, and biochemical cotton, and tighten it with stainless steel bolts and nuts. Wash with water again and confirm that the pH is neutral.

4: The role of cation resin

Cation resin can adsorb calcium, magnesium, iron, copper, aluminum and sodium in water through exchange. . . and other metal ions, while releasing hydrogen ions. Thereby reducing the hardness of the water.

V: Loading of anion resin

1: Buy it from a chemical store, model 201×7 (type 717) strong basic quaternary ammonium type anion resin 5kg.

2: Pretreatment of anion resin

The first step: the same as that of cation resin.

Second step: Use 5% hydrochloric acid solutionthe same amount as above, soak for 4-8 hours, then drain off the acid solution and wash with water until neutral.

The third step: soak in 2%-4% sodium hydroxide solution for 4-8 hours, then drain the lye and wash it with water until neutral.

3: Put the treated anion resin into the plastic cylinder, place the gasket, nylon filter, and biochemical cotton, and tighten it with stainless steel bolts and nuts. Wash with water again. Confirm that the pH is neutral.

4: The role of anion resin

The anion resin can replace chlorine, fluorine, sulfate, nitrate, carbonate and silicate in water through exchange. . . Equal to acid radicals, and release hydroxide radicals. Thereby removing harmful acid radicals in the water.

Five: Connection

Use plastic hoses to connect the three prepared plastic cylinders in the order of low in and high out.

Connect tap water → activated carbon → cation resin → anion resin → water storage tank in sequence. After the connection is completed, close the water outlet, open the water inlet, test the pressure of the water inlet, check whether there is water seepage in the sealing ring and the connection port, and solve it in time.

Six: Precautions during use

1: Control the speed of the water flow, the speed of the water flow should be as slow as possible. When the water can pass through the cylinder, there are sufficient time to exchange.

2: The use time of activated carbon can be determined according to the amount of treated water and the quality of raw water to determine the replacement frequency.

3: The resin will lose its exchange ability after using for a period of time, and it only needs to be regenerated, not replaced. The test methods include conductivity meter and dropwise addition of 5% silver nitrate solution. The ion exchange reaction is reversible, and the reversibility of this reaction allows the ion exchange resin to be used repeatedly. Dropwise addition of silver nitrate can test the quality of water quality.

Regeneration of cationic resin: soak in 5% hydrochloric acid solution for more than 10 hours, drain the acid solution, rinse with water until neutral, then use again.

Regeneration of anion resin: soak in 2%-4% sodium hydroxide solution for more than 5 hours, drain the lye, rinse with clean water until neutral, and then use again.

The above set of devices is more troublesome to manufacture, and also requires the use of chemical reagents with strong acid and strong alkali, which is dangerous. But colorful aquarists who have the ability to make and understand a little chemical knowledge can try it. High-quality soft water can be obtained, which is helpful to the breeding of colorful, especially the reproduction of colorful.